It's down to how the Local Authority interpret what are very general rules.
If you're a hobbyist, selling at 'farmgate' or using somebody to sell on your behalf, then the rules are very light... no HACCP, for example.
However if you have too many hives to count and are selling commercially, then the full food hygiene regulations kick in.
However, even if you are on the 'light' rules, this won't stop somebody suing you if they find glass, or something else other than honey, in your jars.
I would keep reused single use jars for personal use and as gifts to family etc, but use new jars for any paid arms length transactions.