F wrote:

The existing radiator is 790mm wide but I can't find a supplier for a
towel radiator this size. Anyone able to point me in the right
direction? I really don't want to have to start moving pipes at this stage!

If I have to go for 600mm (which seems to be pretty much standard) can
anyone suggest a decent supplier who doesn't want the proverbial arm and
leg?

I've used and can recommend www.featureradiators.co.uk

I found and used them because I also needed a non-bog-standard towel rail.

David