Blood cancer charity Bloodwise has joined forces with UK auction house Classic Car Auctions to launch this year’s Big Welsh Car Show, taking place in Margam Country Park on Sunday 18 September.   The specialist auction house, which is the official sponsor of the classic car show, wants to raise funds for the charity and is appealing to generous vintage car dealers to donate a car. This would be auctioned in December, with all of the money raised from it…