www.rescuemycar.com
I think I paid about £55 for any car personal cover, but you pay a £40 excess if you call them. Your card details are the first thing they ask for. 
I haven't called them out for a few years now, but every time I have someone has turned up quite quickly and recovered me home without fuss. 
I think I have used them for single trip euro trips before, though didn't actually have to use them.
Having a quick look, looking at joint personal cover for me and 'er indoors, it seems to want car details for one car, but quotes different depending what car I enter....
Yes strange that for any car personal cover they want to quote on a particular car. I guess the quote is based on your daily drive. 
Just go with the cheaper car. 
I'll sort some quotes from it nearer the time I need it, and ponder. Then decide, being a Jaaaaaaagg owner, do I want to take the option with or without excess

.
Obviously, if when I tell the AA to sling their hook they come back with a sensible offer, that changes the dynamic a bit.
Green Flag want £120 per person for personal coverage, so despite their adverts, are massively more expensive than either the AA or the RAC. Mongrels.
I could rejoin the CSMA I suppose if their breakdown partner is competitive....
Decisions decisions