YES I'VE FOUND THE ANSWER ITS THE BLOWER RESISIOR.
All it is is a small card about 4 inches by 2 inches. Which slides into a slot under the blower motor.
All you have to do is follow these instructions (any by a new/old card available from a scrapyard).
The link is http://www.cardomain.com/memberpage/299921/2
but of course everthing is on the left side in the UK.
Any problems please post a reply here and i'll try and look here again sometime.
M.D.W.
November 2004