Frank Z wrote:

I had a look at that item - thanks. I couldn't tell from the pic if it
is a normal trv but with a horizontal-facing inlet rather than a
downward-pointiong one - or if it is a thermostatic valve designed to
be fitted some distance from a rad, on a horizontal pipe.

It's a thermostatic valve with 15mm in and 15mm out - exactly
what you need.

--
Grunff