Thanks for your reply. I forget to say the flexi hose was suspect number one and the first item to be changed, alas no change in the symptoms...
There was some thought that one of the seals in the original m/c may have 'flipped' when the g clamp was applied but disassembly proved difficult so couldn't verify.
I haven't talked in length to the owner since the ebay m/cylinder was installed. It cannot have solved the problem though as a second ebay m/cylinder has been ordered. Time will tell if this one is any better.
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