I need a couple of 90 degree wall mounting isolator valves for the H/C
feed to a basin, I've seen them in hotels but can't find them in the
on-line catalogues.
Here's a (poor) attempt at a description: they have a built-in service
valve, the pipe connects to them behind a panel, they're fixed to the
panel, a standard flexi tail connects the tap to them.

Any suggestions where I can get some?

Dave