BS 8621:2017 specifies performance requirements and test methods for a thief?resistantmechanically operated single-point lock assembly (including locking plates, fixing screws, fittinginstructions, cylinders and protective furniture where appropriate) that:

a) incorporates a lock conforming to BS EN 12209:2016 that can be unlocked from the insidewithout a key thereby only allowing keyless egress; and
b) is used in doors, window doors and entrance doors in buildings.

This standard does not cover thief-resistant lock assemblies that only allow egress using a removablekey, or lock assemblies that provide a secure (no egress) mode in addition to keyless egress.Cross References:BS EN 1303:2015BS EN 12209:2016PAS 24:2016BS 7398:1991 BS 3621:2017BS EN 1125:2008BS 10621:2007BS EN 179:2008BS EN ISO/IEC 17065:2012305/2011/EUConstruction Products Regulations 2013Building Regulations 2010