Things to do in London

May to September brings the longest days and the most outdoor events, though it is also the busiest season. Spring and autumn are quieter, and the weather can change quickly at any time of year, so pack a layer.

Yes for timed-entry sights such as the Tower of London, the London Eye and the Harry Potter studio tour, which can sell out in busy periods. Booking ahead often secures a better price and a set entry time.

Four to five days covers the main landmarks, a few museums and a show. Add a day for a trip out of the city to Windsor, Stonehenge or Oxford.

For popular tickets and small-group tours, a few days to two weeks ahead is a safe window, and more in peak season or around holidays. Many day tours and food walks still have space a day or two before, so it is worth checking live availability even for last-minute plans.

Many experiences include free cancellation, usually up to 24 hours before the start time. Each listing shows its own policy, and the ones marked "Free cancellation" can be cancelled for a full refund within that window.