What is this lock?

[cabinfever102]

Does anyone know what kind of lock this is or if I can get a replacement key?

These are some of the biggest brands so it might be one of these?

www.amazon.co.uk/Chubb-Window-Replacement-Lock-8013/dp/B00Y1L73YA?tag=mumsnetforu03-21

www.powertoolsdirect.com/yale-locks-window-lock-key-for-8k102-v-8k102k-2

www.matrixhardware.co.uk/Product/Bramah-Window-Key-LK

I've had door bolts like that, and they are made so you can remove them when they are in the unlocked position (like in your pic)

You see the round holes in the bolt, the screw heads are accessible through them so you can undo them.

I don't recognise the brand. I think you need a tool with a T handle, and a socket on the end to fit. Is it like a half-circle?

I'd take it off and fit a pair of new, matching ones. You usually get two keys per bolt. I recommend handing a key on a cup-hook screwed into a top corner of the frame, furthest from the opening, out of sight from outside, and preferably concealed by the curtain of blind from casual visitors.

This sort of thing
www.ironmongerydirect.co.uk/product/yale-8k116-multi-purpose-locking-bolt-white-pack-of-1-with-2-keys-378769

www.ironmongerydirect.co.uk/product/era-multi-purpose-bolt-white-pack-of-1-with-key-197457

Price looks a bit high to me. Check they work on same key.

Or
www.ebay.co.uk/itm/132506234808

If you have difficulty finding one, message me.