I'm trying to sell a 1991 BMW 325i. A potential buyer changed his mind because, he said, there is a record that says a 318i with my registration was a Category B write off in 1999. I checked with HPI and they confirmed there was such a marker on my registration. I have owned the car since 1991 and the registration plate has never been off the car. HPI acknowledge this. They have launched an investigation involving the Motor Insurance Bureau and an insurance company (they won't tell me who). The investigation should, they told me, have been concluded in three to five working days, but is not yet resolved after two weeks. Until there is a resolution I can't sell my car and I have lost one and possibly many potential buyers. It seems very likely to me that their error caused a poor response to my eBay advertising, which in turn caused me to lower the price. HPI have told me that this is a "difficult" case and that MIB may not allow the marker to be removed. What should I do? Would I be eligible for compensation from HPI and/or MIB for the lack of sale and the reduction in price? Could I use the Small Claims Court?