For a London wedding, your checklist should cover setting a budget, choosing a venue and date, booking an authorised registrar or celebrant, and arranging suppliers such as catering, photography and music. You will usually need to give notice of marriage at a register office at least 29 days before the ceremony, and you should check the current document requirements and any longer notice period that may apply to your circumstances on GOV.UK. Also plan guest invitations, transport, accommodation, insurance and a final payment schedule. Requirements can vary, so contact your local register office and seek professional advice if your situation is complex.