I've used this company before and had a good experience.
However, on this occasion they didn't respond to my requests for a quote either via CheckATrade or via the contact details on their own website.
I can only assume that they are no longer in business, which is a shame as they were pretty good.
Response from CHP Plumb Heat
Hi Steve 👋, i hope you are well, i was on holiday, kinda business trip, so we are back in business