Harrow Locksmiths HA1 | â 020 3807 8764 | Locksmith in Harrow for Locks Change. Emergency Lockout. Doors Unlocked. Locks Supplied & Installed. Windows Locks. uPVC Door lock repair. British Standard Locks. We cover Harrow on the Hill, North Harrow, Northwick Park, Sudbury, Sudbury Hill, and the local areas.