Update - I now have the diaphragm service kit in my possession, is it just a case of changing the brass nut thing in the middle or do I need to change the diaphragm too.
Thanks for any help
found this by mistake ohh your great the part no was a great help and the piccy too called a plumber to fix it,he had a look sucked his teeth shook his head and said thats going to cost a lot(i said fix it)he went away forever lol.so a big thanks to you all just ordered the part cost 15 quid happy days big up you all ta very much
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