A: If there is hot water getting to the valve then probably a strip down clean lube and fitting a service kit will solve the problem.
To ID the valve you just have to compare what you have with the drawings on our site
http://www.showerdoc.com/shower-spares/meynell
You could send us a photo.
To help us id this valve we need a photo with the knobs on, the knobs and cover plate/s (if it has one) removed.
If possible but not always necessary a photo of the cartridge or part required.
Answered 191 days ago | The Doc