I thoroughly recommend Green Flag.
When I had the Renault Espace I had cause to call them twenty five (25) times over a four year period and they were always very helpful, no question about being recovered even with dogs on board or towing.
Other rescue services limit you to a max number of tow ins in any one cover period, which in my case would have left me stranded on a lot of occasions.
The Renault has since been crushed, so I will sadly miss seeing the recovery drivers, many of whom became very good friends.