Thank you sooooooo much for your advice and saving me a packet.  I took your advice and checked the fuses and you were right, the cooling fan fuse was broken and a quick change of the fuse sorted the problem out.  I have a real nice neighbour, who gave me the fuse, so it did not cost me anything in the end.   Hooray  !   Thank you once again for all your help techbod'.   gratefully Debz