I bought a repair kit from Appliance DIY Repairs after reading how other people had fixed their own fridges after buying a kit from this company. It seems they had saved loads of cash. Go to www.adr-ltd.co.uk.
It worked for me. Reasonable price, quick delivery, they knew what they were talking about, and my fridge is cold again! I've been told the fault is very common.
Andy B, August 2010