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Confidential briefing · Sisk × Nutral

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nutral.uk · workforceassured.com
Confidential briefing · Prepared for John Sisk & Son · April 2026
nutral.uk × workforceassured.com

Three years in.
Built the proof.
Now the whole group.

Live in UK Civils since 2023. Three years of audited data through a single platform. Two industry awards. Zero leakage. The model works at scale — and the case for taking it across UK Construction, Ireland and Europe is no longer theoretical.

Cumulative Charge
£6.88M
Since go-live · 2023
Worker Hours Audited
296k
Every hour costed & verified
Workers Onboarded
453
100% RtW · 97% docs
Fill Rate · Same-Day TTF
83%
419 of 502 reqs filled
Sisk Supplier of the Year 2023 NCE Recruitment Solution of the Year 2024 B-Corp Certified 13 Tier-1 agencies under management Zero tax-leakage incidents
01 · The expansion case

Sisk operates in three
geographies. We currently
cover one — partially.

Group revenue €2.75bn. Pre-tax profit up 62% to €58.1m. The acquisition of Farrans extends UK infrastructure capability. AstraZeneca Dublin, Astellas Tralee, Moderna Oxfordshire, and four data-centre programmes across Sweden, Netherlands, Denmark and Croatia. The temporary labour exposure across that footprint is enormous. The assurance gap is bigger.

Sisk live programmes · agency labour exposure

Where you build · where we deliver · what applies

Click any project on the map (or below) to see which of the six service strands apply.

DUBLIN HQ AstraZeneca · Citywest TRALEE Astellas Life Sciences UK · LIVE Civils · Construction SWEDEN Luleå · Data Centres DENMARK Project Wildcat NETHERLANDS ZNL Hyperscale CROATIA Pfizer Zagreb LEGEND Nutral live · MSP active Workforce Assured opportunity
Jurisdictional compliance · what we check, where

United Kingdom · England + Devolved

The benchmark. Every check below is operational at Sisk UK Civils today — replicable to UK Construction and Farrans-acquired entities from day one.

£
Column 01
Tax & Statutory
    ⚙
    Column 02
    Workforce & Site
      Nutral WA Both indicates the product strand carrying the check
      02 · The track record

      From a single tender win
      to a defacto labour function.

      Three full operating years. £6.88M of audited spend. Two industry awards. Zero leakage. UK Civils since 2023 — the case study other contractors are now asking about.

      2023 · Q2
      Tender awarded
      UK Civils go-live. 13 agencies harmonised. Platform deployed.
      2023
      Sisk Supplier of the Year
      Internal award within months of go-live.
      2024
      NCE Award · Recruitment Solution of the Year
      First construction MSP to win at this level.
      2023 — 2026
      £6.88M audited spend, single channel
      5 regions · 18 sites · zero leakage incidents.
      Apr 2026
      JSL provisions live
      UK Civils protected. Other BUs exposed.
      03 · The numbers don’t lie

      Three years of live
      RequiDex data. Nothing edited.

      The production database, exported. Every requisition, assignment, timesheet, and charge — running through one platform.

      RequiDex · John Sisk & Son · 2023 — 2026
      Live data export

      Cost of labour per month · charge & margin returned

      Spend by region · 5 active

      Pay model · CIS vs PAYE

      Requisitions raised
      502
      419 filled · 83% fill rate · same-day TTF
      Active assignments
      538
      18 sites · 30 trades · 13 agencies
      Workers in book
      453
      100% RtW · 97% with compliance docs
      Worker nationalities
      26
      Migrant population tracked & audited
      04 · Beyond reporting

      We don’t just
      collect the data.
      We read it.

      A VMS that delivers tables is a database. The Sisk × Nutral model delivers intelligence — patterns the site team can’t see, risks before they crystallise, and commercial levers that compound over time. Six worked examples, taken straight from your data.

      01
      Workforce concentration · the Pareto signal

      20% of your workers deliver 63% of the hours.

      Long-tenure workers (>26 weeks)
      93
      Hours delivered by top 20%
      63%
      Median weekly hours
      42.2
      Workers active >52 weeks
      31
      A small core of 93 long-tenure workers is doing the heavy lifting on Sisk sites. That’s a productivity asset and a retention risk in one. Action: identify the core, build a loyalty programme around it, and reduce dependency on the agency-churn tail before contractors compete for them.
      02
      Demand volatility · workforce planning signal

      Peak-to-trough demand swings 3× across the year.

      Headcount cycled from 118 in summer 2024 down to 41 in winter 2025. That’s expected in seasonal civils. What’s not expected is doing it without forecast — the data now lets us model it. Forward planning on a rolling 90-day horizon would smooth the cost curve and lift fill-rate confidence in peak weeks.
      03
      Working time · welfare & statutory risk

      616 worker-weeks above the 60-hour threshold.

      Total worker-weeks tracked
      7,020
      Weeks >60 hours
      616
      % of population
      8.8%
      Workers averaging >50 hr/wk
      37
      Working Time Regulations risk is invisible in a static report. Visible in the data. Action: automated weekly fatigue alerts and consecutive-days monitoring — already deployed for Balfour Beatty Regional Scotland — flag this before a HSE incident, not after.
      04
      Supplier concentration · consolidation lever

      Top 4 agencies = 81% of spend. Bottom 4 = 1.5%.

      Concentration is structural — and an opportunity. The bottom four agencies (£100k of spend in three years) carry the same audit overhead as the top four (£5.6M). Action: a managed PSL refresh removes administrative drag, raises the bar for small suppliers, and improves the overall risk profile of the supply chain.
      05
      Workforce diversity · ESG & risk profile

      26 nationalities across the workforce. 29% non-UK.

      A genuinely diverse temporary workforce — and a higher-risk one. Migrant workers face higher exposure to RtW fraud, unlawful deductions, and modern slavery indicators. Sisk’s 2030 Sustainability Roadmap commits to ethical labour. Workforce Assured turns that commitment from a statement into evidence — multi-language interviews, jurisdiction-specific compliance, and lived-experience reporting that flows into your Modern Slavery Act statement.
      05 · The assurance layer

      The proof isn’t
      that we said it. It’s
      that we tested it.

      Every month. Every supplier. Every payslip. The most recent audit (March 2026) is one of 36+ run for Sisk to date.

      0
      Direct CIS payments
      0
      PAYE / CIS misclassification
      0
      NMW breaches
      0
      Rate discrepancies
      36+
      Monthly audits since go-live
      ⚠ Statutory risk · live from 6 April 2026

      Joint & Several Liability is now live.

      Chapter 11 ITEPA 2003 lets HMRC transfer unpaid PAYE/NIC debt up the supply chain — to the end client. UK Civils is protected by the existing umbrella PSL of 11 accredited providers. Every other Sisk BU is, today, exposed.

      06 · The service architecture

      Two products. One
      integrated partner.

      Nutral runs the labour supply chain. Workforce Assured runs the assurance and audit layer. Together they cover every form of temporary labour exposure Sisk faces — agency-supplied or sub-subcontracted — in every market Sisk operates in.

      Product 01 · Nutral MSP

      Where Sisk hires agency labour directly, Nutral runs the desk.

      VMS-driven procurement, onboarding, timesheets, payroll audit, supplier management. Best deployed where agency spend is concentrated and recurring — UK Construction, UK Infrastructure (post-Farrans), and Ireland.

      • → Single source-to-pay platform
      • → Harmonised rates & on-costs
      • → JSL protection from day one
      • → Real-time MI & board reporting
      Product 02 · Workforce Assured

      Where Sisk works through sub-subcontractors, WA runs the assurance.

      A six-strand Ethical Labour Partnership. Pre-mobilisation desktop assessments, integrated worker compliance checks, monthly payroll audits, on-site worker interviews, dedicated in-region advisor, with optional Nutral VMS layer where agency labour is in scope.

      • → Multi-jurisdiction (UK, IE, EU)
      • → In-region forensic advisors
      • → Posted-worker compliance
      • → Modern Slavery Act inputs
      07 · Sector fit

      Every Sisk sector
      has a labour risk shape.
      We’ve seen them all.

      DC
      Data Centres

      Hyperscale fit-out. Posted workers from multiple EU jurisdictions. M&E heavy. Highest exposure to ghost-worker and umbrella misclassification risk. Reference: WA Amazon multi-jurisdiction programme.

      LS
      Life Sciences

      Long-cycle pharma builds. SQEP-critical trades. Cleanroom and process specialists. Reference: AstraZeneca Dublin, Astellas Tralee, Moderna Oxfordshire — all profile-fit for tighter agency control.

      In
      Infrastructure

      Where we already operate. Civils, highways, rail, energy. Post-Farrans acquisition the agency labour bill steps up materially. CIS & PAYE risk concentrated here. JSL exposure highest.

      Cm
      Commercial

      Variable ramp-up profile. Trade flow on/off site. Brick, concrete, finishes — high agency churn. Tight onboarding standards key. UK MSP model directly transferable.

      Hc
      Healthcare

      NHS & HSE programmes. SC-cleared trades, security checks, patient-side restrictions. Vetting standards the highest. WA framework directly applies.

      Re
      Residential

      BTR / volume housing pipeline. Heavy use of self-employed CIS — primary false self-employment risk. Sectoral spend leakage typically 8–15%. MSP model captures it.

      08 · Cases of record

      We’ve done this at scale.
      Twice.

      One in UK Tier 1 contracting. One across five European jurisdictions on data centre programmes. Different problem shapes, same operating model.

      Case 01 · UK Tier 1 MSP at scale

      Balfour Beatty · the largest neutral vendor MSP in UK construction.

      Six business units across UKCS. TEPMP. The HS2 BBV joint venture. Sizewell C CWA. Lower Thames Crossing under preparation. Migrated from a fragmented broker landscape to a single neutral, audited, transparent supply chain — using exactly the operating model now running at Sisk UK Civils, scaled up by an order of magnitude.

      • £400M+ annual labour spend under management
      • 4,500 active workers across 6 BUs at peak
      • 150+ supply chain companies onboarded & assured
      • Full Workforce Assured accreditation across the agency tier
      • Joint & Several Liability framework operationalised pre-April 2026
      • Monthly board pack delivered to Group level — same data structure we deliver to Sisk today

      The architecture works because it’s commercially neutral, technology-led, and built by people who know construction. The same model can run any temporary workforce, anywhere. — Operating principle · validated across 6 BUs

      Annual labour spend
      £400M+
      Single MSP channel · zero leakage
      Active workers
      4,500
      Onboarded · audited · payroll-verified
      Supply chain companies
      150+
      All Workforce Assured accredited
      Programme footprint
      HS2 · SZC · LTC
      UK’s most scrutinised infrastructure schemes
      Case 02 · Multi-jurisdiction WA programme

      Global e-commerce client · data centre & fulfilment programme across UK, Finland, Portugal, France & Italy.

      Five jurisdictions, one ethical labour partnership. Multi-tier subcontracting structures, posted workers, agency labour, and migrant workforces — exactly the risk shape Sisk faces on Project Wildcat in Denmark, ZNL in the Netherlands, the Luleå programme in Sweden, and Pfizer Zagreb.

      • Jurisdiction-specific Desktop Risk & Maturity Assessments
      • On-site worker validation and confidential interviews
      • Site access data cross-referenced with payroll to identify ghost workers
      • Native-language interview capability across 5 jurisdictions
      • Forced-labour investigator-grade leads on the ground
      • Jurisdiction-specific remediation plans and CAP closure

      Standard PQQs miss what worker interviews catch. Documents tell you what should be happening. Workers tell you what is. We’ve built a methodology that works in five legal regimes — Sisk’s six is the same problem. — WA delivery principle · multi-jurisdiction programme

      Jurisdictions live
      5
      UK · Finland · Portugal · France · Italy
      Project type
      Data Centres
      Same shape as Wildcat, Luleå, ZNL
      Capability layered
      All 6 strands
      Pre-mob · onboarding · payroll · interviews · advisory · VMS
      Risk methodology
      Cross-source
      Site access ↔ payroll ↔ contracts triangulation
      09 · The value

      Where the commercial
      case lands.

      Three independent value pools. Sisk gets all three from one partner. The Nutral × Workforce Assured architecture isn’t a procurement saving — it’s a structural risk reduction with a commercial dividend.

      01 · Direct margin

      3% saving in UK Civils. Repeatable.

      The two-stage tender process delivered ~3% straight-through saving on the Civils labour spend — through harmonised margins, removal of broker tiers, and rate normalisation. Same approach scales to UK Construction and Ireland.

      02 · Tax & statutory risk

      JSL exposure removed. CIS leakage eliminated.

      Chapter 11 ITEPA 2003 exposure becomes a contractual matter for the supplier, not a balance-sheet item for Sisk. False self-employment risk under CIS is monitored continuously, not annually.

      03 · Reputational & ESG

      Modern Slavery Act inputs. B-Corp aligned.

      Worker interview programme provides the lived-experience evidence required for credible MSA reporting. WA findings flow into Sisk’s Sustainability Report. Sisk’s 2030 roadmap goals get hard data, not declarations.

      Indicative scale-up scenario
      UK Civils today
      £3.4M
      Annual run-rate · audited
      UK Construction add-on
      ~£8M
      Indicative · post-Farrans
      Ireland MSP
      ~€10M
      Subject to discovery
      EU WA programme
      4 sites
      Wildcat · Luleå · ZNL · Zagreb

      Indicative figures based on publicly available Sisk programme footprint and equivalent contractor benchmarks. Actual scope, pricing and commercial terms subject to discovery and joint design.

      10 · The ask

      A 90-minute
      discovery session.
      With the group leadership.

      UK Construction. Ireland. Europe. One conversation. We’ll bring the data, the references, and a structured value-pool analysis tied to your operational footprint. No deck. No pitch. A working session.

      Book the session → Replay the data
      nutral.uk · workforceassured.com · Built by construction experts, for construction experts.