I have AA breakdown cover that covers multiple vehicles: bike and car, including relay. It doesn't include EU cover but I normally just take out a single trip policy with AA, which is discounted as a member, and is usually pretty cheap but very comprehensive. I've used them in the past to truck a bike back from the Netherlands without any problems. Not sure I would trust the breakdown offered by an insurance company, without reading the small print, as most only cover you to the nearest garage/mechanic and not recover you back home without extra cost. They give it away these days because it's got no real value, this sort of basic cover can be had for about £30 and it's so cheap because they know they can upsell you in an emergency.