uPVC door lock Q

I think something like this is what you're after:

"Euro lock thumb turn" would be the appropriate Google search term

(NB these locks come in different lengths for differemt doors)

Thanks for that - I was wondering what the 35/35 35/40 meant.

However, the other thing I was idly thinking about was a uPVC door lock that you can close, and lock without the key. Like we used to in the old days ....

AFAIK not with a Euro Lock, where the locking principle also relies on bits moving vertically driven by the handle. This is for security because PVC door structures are not normally intrinsically as strong as wood.

You can get a split spindle handle which won't let you back in without a key, but doesn't lock the handle in the "thrown" position so isn't very good for anything other than convenience.

Indeed as was pointed out to us when we fitted such, it can be a security issue if it means you forget to deadlock the handle...

Lee