Well Morse's  hair is growing back over the bald bits and his coat is thicker again. Didnt go back to the vets as a friend reccomended Cod Liver Oil capsules in his feed. No point testing a dog for hypthyroidism when its leaping about like a flea ( combed for them too) and has muscles like Charles Atlas. The combination of turning central heating off during the day and giving him Cod Liver Oil seems to be helping so thats fine. Thanks Liberty and co for looking up your dog  books. :)