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@t.o.
It looks like a normal eurocylinder as far as I can see. I am not familiar with that type of door, but it looks like both of the silver metal plates on the edge of it look like they need to come off, and underneath there will be a single screw bang in the middle that lines up with close to the bottom of the eurocylinder.
Undo screw (it’s long) and hope the cylinder just slides out. If it doesn’t it’s because the lock paddle thing (don’t know the name, the bit that rotates when the key turns, that makes the door lock) is sticking out and getting in the way. You may be able to rotate it with a key in the other side, I’m not sure.
Then measure it and buy one the same - eg 50mm:50mm or 60mm:50mm, 30:60 etc - it’s the length of the cylinder, and each # of mm is either side of the centre (some doors need the cylinder to be longer in.the inside half than the outside or vice versa)