I've always gone with Carole Nash (08002985511). Free breakdown cover (national & european, one ex had her bike recovered from Northern Spain no problem), consistently good service (docs always appear next day). Made a couple of claims on bike policies (one fire, one theft) no hassle. Just paid 330UKP for TPF&T on first car, but that's probably 'cos it's a 1.9 diesel skoda (they also give a discount on car insurance if you have no claims on bike policies). I know the bike policies allow you to ride any bike (third party cover only), not sure if this applies to cars.