I've bought and sold a bit over the last thirty years and have found the best way to value your car TO SELL is to check what prices are being asked for similar cars within a reasonable travelling distance. There are about 40 similar cars to yours for sale within 100 miles of Swansea just on AutoTrader. They start just under £10k with lower miles so if you want to sell that's your competition. Setting a firm price just under a price threshold e.g £9995 gets your ad' viewed in more buyers search results. Good luck.