Yes Iain, I have found a picture on the internet of a Yorkshire valve so can verify that it is the same. I presume the valve has to be cut off in order to separate the pipes, I have the plumbers brochure showing the towel rail I purchased with the relevant information. If I take a photo of the valve and the brochure, will the merchant be able to advise which bits I need to lengthen the severed pipes and also the ones needed to attach it to the towel rail? I am more hopeful of getting it sorted now thanks, was beginning to think that the parts needed were obsolete and that was why the builder was not returning my calls or answering my messages. I presume he didn't know how to do it. I will get another plumber to do the job once I get the parts. Many thanks to all concerned for the help.
Grandma Scooter, September 2008