On 02/04/2018 15:04, Brian Reay wrote:

There
is a wall into a conservatory but I'm not sure if you can fit a cat flap
in a wall.

I have done so. Can make it easier to get bottom of the cat flap at
about the same height as the cat's tum than in a door.

I've not done one in a cavity wall but AIUI with them a "lining" for the
tunnel is *strongly* recommended


--
Robin
reply-to address is (intended to be) valid