Christian McArdle wrote:
You can get cylinders for Euro type locks which have key on one side and
a knob on the other :

http://www.locksonline.co.uk/acatalo...Cylinders.html

That seems a possible solution too, thanks.

They are useful if you have a Euro lock type door, typically a uPVC or
aluminium type. Mortice and latch type locks are normally fitted to wooden
doors.

Christian.

I'm sorry but that's a load of C****.

Euro locks as recommended are absolutley the solution to this problem
and it astonished me that this thread got to something like 20 posts
long before someone made the most sensible and obvious solution. In
fact shame on the lot of you as DIY'ers that you all came up with such
usefless suggestions.

There is absolutely no reason at all why they cannot be fitted to
wooden doors - I've fitted one to a modern wooden door and one to an
old wooden door without any thoughts of their being difficulties. Euro
locks are a dead lock operated externally with a Yale type key and
internally with just a turn knob. Further more they are cheap - £7
out of Screwfix.

Rob