The (UK) legal limit for HMF in Honey is 40mg/Kg as per Schedule 1 Criteria 6 b(i) of the
Honey Regulations (devolved equivalents apply in Scotland and Wales)
Honey with a "declared origin from a tropical climate", and blends including such honeys, has a separate higher limit of 80mg/Kg in the UK (this was formerly a derogation from the EU limit of 40, and was I understand the only derogation above 40mg/Kg in the EU when the UK was a member) but that won't apply to UK beekeepers storing/processing/selling their own honey.
There is no limit on HMF in honey sold as Baker's Honey.
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as per the table above e