Do the certificates have an expiry date or is it a case of once it is done you never need to do another one?
Most markets will want to see copies of your documentation before they let you sell (not all though). Usally a hygiene rating from your local council or an acknowledgement that you registered with them to sell consumable items. Although honey is very low risk and some authorities are just happy that you register your intention to sell honey and won't insist on a visit (that's the majority as they are very understaffed) due to government cuts....Good old conservatives for you
Best to check with yours.
If they want to inspect for 5 star hygiene rating they (and the market) will also expect you to have completed a basic level 2 hygiene certificate. This can be done on line, multiple choice questions, take as often as you want until you pass, around £20. Easy peasy.
It's a lot less hassle if the Market manager doesn't ask you for any of these, although if you get inspected by Environmental health you may be asked to stop selling.
Your level 2 certificate doesn't expire, but if the local environmental health do check you for the star hygiene rating system they will re-inspect at approx 3 year intervals for food hygiene rating. It gives your customers confidence in you when you can display a 5 star rating on your stall.
I do 2 different circuits of farmers markets, one want to see all documentation before I was allowed to sell, other didn't ask for a thing. They assumed I had the necessary cover etc..
You will also need third party indemnity, not sure if the BBKA cover suffices. I have a policy with the National Market Traders Federation which covers me for around £90 a year.
There are a a lot of grey areas about honey sales, but as the set up is relatively painless it does cover your ass if someone breaks a tooth on a piece of broken glass inside one of your jars. Or your stall blows over on top of someone...another grey area. If it's your own stall you are responsible, if it's a hired stall the market is responsible.
A lot of country shows I do insist that you have all three and want to see copies before they will allow you to sell there....so it depends where you intend to sell.
It's all stuff and nonsense really. But alas is the world we live in all elf and safety. However, having seen some of the cowboys and their tricks out there I can understand why they are insisting on it.