I'm not convinced you're right. You only need *one* check valve per side
which stays with the rad, because turning off both valves will keep the
water in the pipes. The two bits illustrated don't look to me as though
they
join to each other - but rather that you use one on one side of the rad
and
the other one on the opposite side.

So the question remains - why do Screwfix deem us to need one of each
type,
rather than selling them separately and allowing us to 'mix and match'?
--
Cheers,
Set Square
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Screwfix union/compression pair, no. 33123

Screwfix union pair, no 30364