Try a search in the Travel section, loads of tips and several threads there.
In the meantime, AA gets my vote. An annual multi-trip Breakdoown cover. Have tested it out both in a car and on a bike. First class service.
I also buy the AA's annual multi-trip Travel Insurance policy. Have also tested this out, once. First class service.
You get a discount if you buy both policies and if you are a member of the AA in the UK.
PS Do not forget that most Breakdown covers DO NOT cover recovery of your bike should you be unfortunate enough to be involved in an accident. This is simply because an accident is not a breakdown. The first question you may well be asked are the details of your insurer, who (of course) will only be interested if you have Comprehensive cover. The Breakdown insurer will then, quite possibly, help you to recover your accident damaged bike (even though they are not obliged to) and then recover the costs from your motor insurer ie. add it to your claim.
PPS From a sad thread you may have seen on this site, it is very important that you check the details of any policies you buy. One thing to check is that you are insured to ride a motorcycle with a cubic capacity of greater than 125cc.