In an earlier contribution to this discussion,
anon wrote:

PS - While as a valve they are exactly the same Screwfix designate
those with the an externally fitted tail & compression fitting as
"Lockshields" and those with an Allen Key tail & cone joint as
"Radiator Valves" I think Wickes do the same.

I don't think that's true! For example, http://tinyurl.com/kfzk5 has an
external spanner fitting on the tail and compression joints - but is
designated as an RV.

SF seem to have more or less given up on what they call "wheelhead" valves -
and only have TRVs and lockshields - so there are precious few manual valves
to compare with their lockshield counterparts.
--
Cheers,
Roger
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