Hi,
Ginny had her vet apmt tonight and it's good news!
The vet said its not a mouth infection (he had a good look inside) but that it's actually something to do with the oils in her skin reacting with her saliva and producing this brown stuff on her fur, he's given her a long lasting antibiotic injection to help it. He did say that we could try bathing her with a shampoo, but he knows from experience that unless a cat likes water, it does not like being bathed and just stresses it out more - Ginny does not like geting wet! He did take a sticky tape sample from the leg and had a look under the microscope and that showed up as ok - so no fleas.
He did say that that is normally an underlying thing of another condition - he mentioned thyroid, but he said that a cat her age (15) theres no point in doing test upon test (especially when she's not insured), pulling her about, and numerous visits to the vet - just to keep an eye on her over the next couple of weeks - if she gets worse i.e. appitite goes, drinks more to get her back to the vets.
I think I'd best go now as she's eyeing up my lap