Mark wrote:
I am having a problem unlocking a uPVC door. The key inserts and
turns as if it was OK but, at the point where I would expect the door
to unlock, it won't turn any further.

Is there anything simple I can try to get in?

I assume you have wiggled, pressed, pulled the handle whilst trying to
turn the key?
If so it is most likely that something has broken in the locking
mechanism rather than the the euro cylinder itself.

Maybe a locksmith type on here can give you a better hint.

Good luck

Bob