Sources and evidence policy
Primary official sources outrank marketing copy. Every material claim should carry a source and a last-checked date where freshness matters.
Core official sources
- HMRC 2026 revaluation statistics
- GOV.UK Check, Challenge and Appeal collection
- GOV.UK challenging your valuation
- GOV.UK business rates estimate and multipliers
- GOV.UK Small Business Rate Relief
- GOV.UK Supporting Small Business Relief
- HMRC Business Rates API 2.0
- Office valuation guidance
- Factory, workshop and warehouse valuation guidance
Evidence policy
Official rules and observed data are labelled separately from X-Ray screening heuristics. Each paid Evidence Pack should show source, date, scope, assumption and limitation next to every material conclusion.
Source audit refreshed: 8 August 2026.