How do you handle a plus-one who is a person who is a partner of a guest but not invited by name?

The right approach depends on how established the relationship is. A partner you know and have met is usually treated as an individual guest rather than a generic plus-one. If they are a fiancé, fiancée or long-term partner, write their name on the envelope and seat them with your guest. This shows respect and avoids awkwardness on the day.

For newer partners or casual dates, it is fine to offer a plus-one only if you want to. If you decide not to invite them, tell your guest privately and early. A short, warm message works best. Say you are keeping the guest list tight and hope they understand.

A few things to keep in mind:

• Do not put 'and guest' on the envelope if you do not know the person's name.
• Never ask your guest to introduce you to their date on the day.
• Keep seating plans flexible so partners can sit together.

If you are unsure about any wording or rules, check GOV.UK or ask your register office or place of worship.