London attractions to book before your trip — and what can wait

The wrong way to plan London is to prepay for six attractions before you know how far apart they are. Book the scarce experience first, reserve flexible or free entries later, and leave enough open time for weather, delays and discoveries.

The short version: limited tours such as Big Ben deserve the earliest attention. Paid Royal Museums Greenwich tickets are sensible to prebook once your day is fixed. Free timed museum tickets can usually wait until the itinerary takes shape. Always buy from the attraction or its named official seller.

First priority: genuinely limited tours

The official Big Ben tour is a clear example. Parliament says tickets are released three months in advance at 10am on the second Wednesday of every month. From August 2026, the published price is £55 for adults and £35 for children aged 11 to 17. The tour lasts about 90 minutes, involves 334 steps and is not open to children under 11.

That combination of limited release and physical requirements means it should be decided before less scarce attractions. Read the official 'before you book' page, not just the ticket headline.

Next: paid attractions on a fixed neighbourhood day

If Greenwich is definitely in the plan, booking the Royal Observatory or Cutty Sark ahead removes one uncertainty. Current adult online prices checked on 22 September 2026 are £24 for the Observatory, £22 for Cutty Sark and £38 for the combined day pass. Those figures can change. Decide whether you truly have time for both before buying the pass.

The same rule applies elsewhere: a pass is a saving only if you would have paid for every included attraction anyway.

Later: free timed reservations

The British Museum offers free general admission and advises reserving a free timed ticket. A reservation can shorten uncertainty at a busy period, but it does not need to control the whole holiday months in advance. Make it after flights, accommodation and the broad daily areas are settled.

Other free museums use their own booking systems and policies. Follow the official site for each institution instead of assuming one museum's ticket rules apply to the next.

Group bookings need one owner

When several people are travelling, let one person hold the confirmed date, entry time, booking reference and official address, then share a copy with everyone. Names on tickets should match the attraction's requirements. Agree in advance what happens if one person is late; the rest of the group should not discover the policy at the entrance.

Keep card statements and confirmation emails until after the visit. A screenshot is useful when mobile signal is poor, but it may not contain refund terms or the link needed to change a booking.

Map days before buying passes

Group attractions by area and include the actual journey between them. Westminster and Greenwich may both look like central London to a first-time visitor, but they are not neighbouring ticket entrances. A cheap combination pass becomes poor value if its opening times force an exhausting cross-city day.

Calculate the individual tickets you genuinely want before comparing any pass. Ignore the advertised maximum saving unless your real itinerary reaches it.

What not to book yet

Do not fill both morning and afternoon every day with non-refundable tickets. London journeys take longer than map distances suggest, and a delayed train or a long lunch can turn the next booking into a sprint. Leave at least one substantial open block every couple of days.

Before paying, check the date, time, refund terms, named entrance, age limits and accessibility information. Take a screenshot or download the ticket, but keep the confirmation email too. Search advertisements can imitate official pages; begin from the attraction's own website.

Good planning protects the rare experience while leaving the ordinary day free to change. That balance is more useful than owning a folder full of tickets.