I have used GEM Recovery Its a breakdown insurance scheme that covers you as a member in any vehicle but you do have to pay up front then claim the money back I've used them about six times over the last 8 years lucky me eh! Never had any probs in claiming the money for a recovery back. See their website below. Not the quickest though as they generally have to callout a reasonably local recovery company but you can just use whichever recovery service you want if you know their phone number.Its a bit of a pain filling in claim forms but when its done they are usually quick to re-imburse you.
http://www.gemrecovery.co.uk