Do you have existing breakdown cover? We have ours with teh AA and got a good deal through that. Alternatively, you can get money off AA/RAC by buying one of their European atlases and quoting the offer code they often include, stuck on front over.
We have the car insured with More Than and More Thans breakdown - it costs very little with them to upgrade to European cover - the house is also with them (and no I am not a loyal insurance buyer, I shop around for every policy every year) as they cover me for working from home and they cover the camping kit when we are abroad.
Christine
Don't forget to leave a review of the French and other European campsites you have visited!