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Currently my place takes maximum booking for 7 persons - how to I change that to 6?

TIA for any help to resolve this issue.

As the new UK Gov guideline states only groups of 6 can meet in social events.

Therefore, I need to change my full occupancy amount from 7 down to 6 persons.

I've been looking how to do this but can't see how?

Can someone please advise.
Thank You.