Have a look at:
https://www.moneysavingexpert.com/car-i ... own-cover/
Autoaid seems to be consistently recommended, though it is a 'no frills' service.
Quote:
" • It insures the person, so you'll be covered in any eligible vehicle you're driving at the time of the breakdown. The vehicle must have up-to-date tax and a valid MOT.
• Free cover for a husband, wife, civil partner or common-law partner. You'll need to provide proof of the relationship within seven days, eg, both names on a utility bill, shared ownership of residential property or joint lease or rental agreement.
• It provides onward transport. Most budget policies only allow the car to be fixed at the roadside or towed to a garage. With AutoAid, you'll get transport to your chosen destination for up to six people.
• Home breakdown cover, limited to £65 per call-out. It pays for labour and recovery, but not parts. The £65 limit is usually enough to cover the call-out fee and any basic labour charge.
AutoAid do not have their own fleet, so notify local recovery operators to help you instead. MoneySavers who use it have mostly reported positive feedback, though there have been reports of not-so-great experiences."
trying to explain how much money i had saved them was a waste of time. 
