On Thursday, 13 June 2019 23:36:28 UTC+1, Nick Odell wrote:
Doh! So why didn't that show up in my searches? Thanks - that's just
what I need and having dug the other one out of the loft and it showing
the same reluctance to convect heat, I guess I'll buy a couple of them.

Or even a few, on the basis that they seem to be unreliable ;-)

Owain