I had a good quote from Peter James and was going to take them up on it until I found out their breakdown cover is provided by the RAC. Having been insured previously with Footman James (who also used the RAC) and having experienced the utterly abysmal breakdown service from the RAC a year or so previously, that really was a deal-breaker.
While CN's breakdown service recovered my dead bike from Normandy in time to catch the ferry, and had another vehicle waiting to pick it up this side and bring me home.
Clearly this wouldn't be of major importance to you if you're not riding them much though.