Look at the National Farmers Union "Smallholders " policy
It would NOT cover you as a beekeeper against losses if your bees were unfortunate enough to get American Foul Brood, or any other disease ( not 100% sure on this as fortunately have never had to make a claim), but it DOES provide cover against loss of bees and hives and equipment against theft/fire /flood, on or off of your property.
Also giver full cover for "producers" providing that you comply to the letter of the law/rules/regs, this includes selling to wholesalers and third parties, plus gives comprehensive cover for selling at food festivals, farmers markets etc etc.
For food production you would have to hold the correct certification and have regular inspections of your clean room etc.
Also covers against Jo public attempting to sue you for allowing your bees to sting or otherwise annoy them!
HACCP and risk assessments must also be in place if you allow the public onto you property / apiaries.
I now only pay the £25 to BBKA and do not bother with the BDI ( plus we run 40+ colonies and fall outside their remit)