Stock answer #23 in a series of #shedloads
Just go to Moneysupermarket or similar to get a quote. Read the T&C as some of the policies on offer are very cheap but they are very stripped back with a large excess. If you own an older bike, just be aware they won't bring the bike back if the transport costs exceed the bike value. They will buy the bike and get you home via Easyjet and a taxi.
Personally, I have an annual policy from LV, UK & Europe. Covers any vehicle in the UK and a named vehicle in Europe. About £50 via Moneysupermarket plus £13 extra for personal cover.