Lock Stock Lock Smiths offer a range of UPVC door locks, handles and cylinders, as well as a wide selection of traditional mortice and Yale nightlatches. Brands included are ERA, Avocet, ISEO, Chubb, LockMaster, Ferco, Fullex, Maco, Winkhaus, Yale and Yale Doormaster replacements. Our trained Yale Doormaster installer can offer a multipoint lock upgrade that will fit the majority of UPVC, composite or timber doors across a wide spectrum.