So I bought that door I was asking about, got a big chunk off th asking price due to lost keys....

Ive already acquired a nice digital combination lock that I'm going to fit, but would like a key lock too,

when ive opened the back the lock is tiny! I've found a picture in a website that says the original lock is a Chubb C1717 are there any direct replacements?

The footprint is 3 holes, the top two 41mm apart, the third hole looks to be dead centre and 61mm down.

there is also another hole footprint, 4 holes 41 MM X approx 55 mm,

are these standard footprints?