Hampstead Locksmiths NW3 | â 020 3807 8764 | Locksmith in Hampstead for Locks Change. Emergency Lockout. Doors Unlocked. Locks Supplied & Installed. Windows Locks. uPVC Door lock repair. British Standard Locks. We cover Belsize Park, Frognal, Childs Hill, South Hampstead, Swiss Cottage, Primrose Hill, Chalk Farm, Gospel Oak, and the local areas.