Plan a wedding budget you can live with afterwards

Help me plan a wedding budget.

Target total: [amount]
Guest numbers: [approx]
Must-haves: [list]
Nice-to-haves: [list]
What's already booked and costed: [list]
Who's contributing: [optional]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. A category budget that adds up to my target.
2. Cost per guest and what changes if we cut or add 10 guests.
3. A cut list ranked by saving versus regret.
4. A monthly save-up plan to the date.
5. Forgotten costs (banking tips, alterations, transport).

Stay inside the target. Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, figures or products. This is help organising my own numbers and wording, not financial advice; point me to MoneyHelper, GOV.UK or Citizens Advice for guidance, and to a free regulated debt adviser if I'm struggling to pay. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.