In message , at 09:44:56 on
Thu, 15 Oct 2020, Thomas Prufer
remarked:
On 14 Oct 2020 20:31:14 GMT, Bob Eager wrote:

Or get a Eurolock cylinder that works even with the key in the other side...

I see I was unclear in my upstream post: Cylinders can be bought either
way. The more expensive ones can be changed over, though this may
require knowledge and/or tools to contain tiny springybits, and/or
small precision bits to exchange. (Disassembly tends to be much easier
than assembly!)

Won't DIY work of that kind invalidate the kitemark, and thus your home
insurance?

I don't know what kind of certification a "locksmith" would need, to
maintain the kitemark status.
--
Roland Perry