For a more accurate estimate please provide detailed information about your Night Latch .
The following are the most common Night Latches found in London area.
Union 1027 Standard Cylinder Night latch (40mm Backset)
ERA 133 Traditional Night latch
ERA 183 Double Locking Night latch
Cisa 11630 Electric Rim Lock With Hold Back
Ingersoll
Banham High Security Night latch