The wedding is the part everyone plans. Before it, there's a quieter legal process that no one explains clearly, and getting it wrong is the one thing that can actually stop the wedding from happening on the day.
Here's the UK legal route from engagement to marriage, in order and without the jargon.
What giving notice actually is
Giving notice is a formal declaration, made in person at your local register office, that you and your partner are free to marry. It's not the wedding and it's not the ceremony booking, it's the legal green light that lets the ceremony happen.
You both must give notice together, in the district where you each live. If you live in different districts, you each give notice in your own.
The steps, in order
Book the notice appointment at your local register office. Bring your documents. Give notice, which takes about half an hour, including a short interview each. Then wait: notice must be given at least 28 clear days before the ceremony, and the ceremony must take place within 12 months of the notice.
That 28-day minimum is the part people trip on. Book the appointment at least a couple of months before the wedding, not four weeks before.
The documents you need
The exact list varies slightly by register office, but you'll typically need proof of identity and nationality (a passport), proof of address (a bank statement or utility bill), and evidence that any previous marriage ended (a decree absolute or death certificate). If you were born abroad or changed your name, bring those documents too.
Check with your own register office before the appointment, because turning up without a document means starting again.
The 70-day rule, explained
For most couples the waiting period is 28 days. If either of you is subject to immigration control, the Home Office may extend that to 70 days while it reviews the case. That's not a penalty and most couples still marry on time, but it means anyone in that position should give notice even earlier.
Fees and timing
Giving notice costs around £35 per person in England and Wales, slightly more or less in Scotland and Northern Ireland. The ceremony itself is booked separately with the register office or the venue. Book both as early as you can, popular dates and register offices fill months ahead.