Just got back from the vets. Am lucky in that they will see me straight away if I'm ever worried about anything (and they didn't even charge me today!).
Well it is a lump once we'd shaved the fur away (Wilf is such a patient angel when he goes to the vets and as he loves the place, strange dog, he always feels at home there). Vet I saw thinks it could be a fungal infection (even though I keep his ears clean) so for now I've got to get the old malasseb shampoo out and keep an eye on him for any other lumps. My regular vet, Steve is on his hols for the week so if there are no other crises re lumps and this present one is still there then I'll take him back to see Steve on Monday. Panic over but I'm not uncrossing my fingers too much until this lump has gone!