Sounds like the slave timer that has failed. We stock it at £25+vat (£20+£5 post). You can order it here :
http://www.emwelec.co.uk/index.php?action=item&id=119&prevaction=category&previd=1&prevstart=0
It is an exchange price, so we would need your old unit back within 14 days. You can call us on 0115 9652118 if you need any help.
EMW
April 2009