Colin Wilson wrote:
My father supplies and fits ground and air to heat recovery systems.
I can post a link. but don't know if it is allowed in this group.
I'm sure very many here would be pleased to see the link, me included

I agree - go for it

ok. the web site is work in progress. but there are links to our email, we
also have a working showroom.

www.jack-elam.co.uk

Gary