We spoke to the vet last night and they are hedging their bets on it being a tumour

They can't / wont give us an estimated time scale so we are just going to enjoy our last days / weeks / months with him.

Its so sad - hes such a lunatic ! He makes us laugh every day - the other night he dragged a 2kg bag of potatoes from the kitchen to the lounge to play with!

Still - at least hes still with us

Thanks for your thought....