In article , Davey
writes

Since I am not the only one to make a similar warning, I think that
readers can indeed make their own conclusions. It's not a risk worth
taking, in my view. I have had an insurer try to not pay up for water
damage because 'the water was of the wrong type', ie it came from
melting snow, not under the door, so don't tell me that they don't try
to wriggle put out of paying claims.
And a qualified Gas Installer should know a lot about all aspects of
Heating systems. He will probably have a HETAS certificate. The one we
had in to estimate for our aborted wood burning stove installation did.

And that is the beauty of usenet, your unfettered right to reply.

However, when you say, "will invalidate your cover" as if it is fact in
the given context when it not, expect a robust correction from me.

--
fred
it's a ba-na-na . . . .