Travel insurance is relatively simple.. I use the Post Office travel insurance, as I know they cover for motorcycle riding of any cc and Royal Mail employees get staff discount.
Breakdown cover for 4 days in Europe might prove a bit tricky though.. I guess, because you're asking, you're not covered by any breakdown included in your insurance..? If not they may be able to tack it on for the remainder of the term for less than you'd pay for cover from a breakdown company..