How do you tell a guest they can't bring a plus-one?

Address the envelope to the guest alone. This is the clearest signal that the invitation is for them only. Do not add 'and guest' or write any note on the envelope explaining the limit.

If the guest asks, reply with a short and honest message. You might say that space is limited and you are keeping the day to close family and friends. Keep the same reason for every guest so it feels fair. Do not give different explanations to different people.

It is best to set this rule early and apply it to everyone. If you offer plus-ones to some guests but not others, it can feel unfair. Decide on your policy before you send save the dates.

For long-term partners, consider naming them on the invitation if you know them. This avoids confusion and shows you value them. For casual dates, 'and guest' is not needed.

This is etiquette, not law. If you are unsure about any legal part of the ceremony, check GOV.UK or ask the register office.