What has the Home Office got to do with Certification specifications? The default UK Cert spec is Def Stan 00-970 sponsored by the MAA, nothing to do with the Home Office. The US Army’s AMRDEC is mutually recognised by the MAA as suppling quality equivalent Certification artefacts, the UK Delivery Team then has to show equivalence of these artefacts to the Def Stan to gain UK Certification. RA 5810 Annex A refers and details the process.