Your washing machine’s extended warranty is probably an insurance contract in which the risk will have been calculated in the usual manner and if you have had work done which you value at £300 (including profit) for a premium of £75, celebrate the fact that you are winning. The 1979 Sale of Goods Act, improved by the 1994 Act provides you with statutory rights two of which are that the goods must be of satisfactory quality and they must be suitable for the purpose intended, as E51 says two breakdowns may not prove you have faulty goods.