British Standard mortice deadlocks, Conforming to British Standard number BS3621: 1998 for Thief Resistant Locks. This is a high security mortice door lock uk that has been rigorously tested for burglar resistance. This type of door lock has a single 'dead' bolt

Chubb 3G114E BS Deadlock £37.74	Chubb 3G220 Deadlock £71.44
Chubb 3U114E BS Deadlock British Standard £32.27	ERA 231/331 Fortress Classic Deadlock £24.46
ERA 261/361 Fortress Deadlock £22.42	ICL 6 Lever Deadlock £35.69
Legge 5641/5761 British Standard Deadlock £35.69	Securefast British Standard (BS) 5 Lever Deadlock £19.35
Union 2134E BS Dead lock £30.59	Union Deadlock ( Union 2100 BS) £28.54
Walsall 661 BS Deadlock £23.44	Walsall BS Euro Deadlock £40.80
Walsall BS Euro Deadlock (with thumb turn) £45.91