PPN 06/21, SECR, and DEFRA 2025. Plain English. No consultancy jargon.
Mandatory for any supplier bidding on UK central government, NHS, or defence contracts above £5 million. You must submit a Carbon Reduction Plan that shows your current emissions baseline, your Net Zero commitment by 2050, and the specific environmental management measures you are taking.
The Plan must be signed by a Board Director or equivalent. It must be published at a publicly accessible URL on your website — so procurement teams can verify it.
What CarbonTrack produces: A PDF Carbon Reduction Plan formatted to the Cabinet Office CRP template. DEFRA badge. Formula trail appendix. Director signature block. Public verification URL at usecarbontrack.co.uk/public/your-company.
Mandatory for UK companies meeting two of three criteria: 250+ employees, £36m+ annual turnover, £18m+ balance sheet. Required to be published in the annual Directors' Report filed at Companies House.
SECR requires disclosure of Scope 1 and Scope 2 emissions plus at least one material Scope 3 category. For most manufacturers and contractors, Scope 3 Category 6 — business travel — is the most material.
What CarbonTrack produces: A SECR-compliant annual report showing your Scope 3 Category 6 emissions with full methodology statement, DEFRA factor source reference, and trip-level formula trail for auditor verification.
The Department for Environment, Food and Rural Affairs publishes updated GHG Conversion Factors annually. Table 5 covers passenger transport — the factors used for Scope 3 Category 6 business travel emissions.
Using outdated factors in a statutory filing is a factual error. Using Google Maps road distances for flights instead of Haversine Great Circle is a methodological error. Both are common in manually maintained spreadsheets.
What CarbonTrack does: Stores all 15 DEFRA 2025 transport factors to six decimal places. Applies Haversine automatically for all air travel. Records which factor version was used against every entry — permanently.
The GHG Protocol Corporate Standard defines business travel as Scope 3 Category 6: emissions from employee travel for business purposes in vehicles not owned or controlled by the company.
This includes flights, trains, taxis, hire cars, and personal vehicles used for business. The calculation methodology is distance-based — actual or estimated distance multiplied by the appropriate emission factor for the mode of transport.
What CarbonTrack produces: GHG Protocol aligned calculations with explicit methodology notes on every report. Haversine for flights per DEFRA guidance. Distance Matrix for road and rail. Every output references the standard.
When your SECR report or Carbon Reduction Plan is queried — by Companies House, a procurement team, or an external auditor — these are the four questions you must be able to answer.
CarbonTrack answer: DEFRA 2025 Table 5 · Flight-Domestic · 0.255133 kgCO₂e/km · Applied 14 Mar 2025
CarbonTrack answer: Haversine Great Circle formula · Manchester 53.3498°N 2.2744°W to London 51.4775°N 0.4614°W · 267.2 km one way · 534 km return
CarbonTrack answer: 534 km × 0.255133 kgCO₂e/km × 1 passenger = 136.24 kgCO₂e = 0.136 tCO₂e · Stored 14 Mar 2025 09:42 UTC · Immutable
CarbonTrack answer: DEFRA 2025 factors · Published March 2025 · Factor version recorded against every entry · Annual update applied automatically
Every trip. Every formula. Every factor. Stored permanently and accessible on demand.