If it's just breakdown cover you're after, try with Aviva. I have personal breakdown to cover me in/on any vehicle including my motorbikes ,and with full European cover included to cover my touring holidays (I double checked specifically to confirm it did cover me on a motorbike in Europe) . It is actually with RAC but through Aviva and is significantly cheaper than when I was previously covered direct with RAC.
It's basically around £100, which I think is a bargain. I do have other Aviva policies so not sure if it is discounted.
Worth a quote.