Nightlatches

A chart showing different types of rim cylinder replacements, their available colors, time taken for replacement, and starting prices. The cylinders come in brass, satin chrome, and chrome finishes, with prices ranging from £14 to £25 and a standard replacement time of 15 minutes.

These are more commonly known as Yale locks. However, the locksmith name for these are nightlatches. 

A price list for night latch replacement options showing different lock types, colors, time taken, and prices. The options include 5 pin low security, 6 pin low security, and 6 pin high security. The colors available are brass, satin chrome, and chrome. Each lock option takes 25 minutes, with prices ranging from £25 to £35.

The British Standard 3621 variant

An advertisement for BS 3621 Nightlatch replacement with an image of the lock and keys, available in nickel, satin nickel, black, brass, satin chrome, and chrome finishes. The price is £80, and the service takes approximately 25 minutes.