Thanks, I'll take some pics at the weekend and post. I just found out the door was supplied and fitted by Nationwide, so I may ask them for advice, I'm guessing they could be pricey though.
It's one of their York doors...
http://nationwidewindows.co.uk/doordesigner.php
First post so please be gentle.
I've just bought a flat that's just had a new composite type door fitted. The lock seems to be a deadlock type with a trigger that activates claws, top and bottom.
I was wondering if it would be possible to swap or convert the lock from one that needs...