I would if I could - it is the obvious safe solution.
However I can't seem to Google any suppliers.
Hence the question about universal fit

The following are claimed to stock Siemens:

http://www.rexelsenate.co.uk/
http://www.neweyandeyre.co.uk/
http://www.ac-electrical.co.uk/

Some of the websites are pretty useless, though.

Christian.