Pre booking attractions in London

The Science Museum is great for kids. Entry is free ( donation requested) and the lines are not long, unless a school,group is entering. There is fee for special exhibits, and if there is one of those on during your visit that you want to see, then pre-booking is advised as they can sell out.

https://www.sciencemuseum.org.uk/visit-us

The Transport Museum needs no pre-booking, in our experience.

If you want to see a Shakespeare play at the Globe, you do need to book that now as they can sell out. I bought our tickets for the Merry Wives of Windsor performance in late May on the day the tickets were released to the public, February 4. When I signed on the website in the morning, West coast time, it was mid-afternoon in the UK and at least half the seats for the performance we wanted were already gone.

The London Transport Museum doesn’t need to be booked in advance and the Science Museum is free.

Poor kids having to suffer tedious Shakespeare!

For theatre tickets, head to the Tkts booth in Leicester Square at lunchtime the day that you want to attend for the best prices.

Any interest in the WWII sights? IF so, book the Churchill War Rooms ahead of time. I find these fascinating...to see the actual rooms Churchill used for planning during the war just boggles my mind. I don't think it sells out but there is a huge line if you don't have advance tickets. No point in wasting time in a line!

June is just around the corner. London will be full of tourists. Queues (lines) will be everywhere

Depending on your interests book now for;
Churchill War Rooms
Sky Garden
Tower of London ( go when it opens and head straight to the Crown Jewels)
The Globe

As already shared Science Museum is free and thus extremely crowded but it’s great.

Transport Museum fewer hordes but still popular.

I always recommend the free Museum of London so you can see how the city you are visiting evolved.

Might also check out the Calvary Museum
( Horseguards ). Not free but interesting

FREE Museums:
Wellcome Collection
The Docklands
Horniman Museum
National Maritime Museum
Grant Museum Of Zoology
The Bank Of England Museum

Loads of museums to peak your interest.

Enjoy your trip

What I found was, for the attractions that are not free, there's a discount of £1-5 for booking in advance. A trick I learned was that for many things, the morning of your visit is far enough "in advance." A big exception is the Churchill War Rooms; due to their popularity, you'll want pre-booked tickets so you don't have to wait in long lines.

For any place that you are possibly visiting, look now at their website. If there's a discount for advance booking, even if you're not sure you will visit, create an account while at home (MUCH easier on a computer than a phone!). Then, if you do want to visit, you can log in and book the tickets quickly that day. Just be sure to see if the tickets can be scanned off the phone, or need to be printed (your hotel can often do this).

I used this trick for Greenwich with great success. I wasn't sure I was going to go, but when I had a really nice day, I was able to book tickets that morning and save over £5 (alas, that was last year, and the discount isn't as good now).

Hi! Thanks to everybody for the quick and useful answers. I shall definitely look up the websites of all the attractions for any real fare differences in pre-booking versus on-the -spot. My main aim, though , is to try and avoid the queues at the attractions and waste time there.
One more thing I had forgotten earlier - what about the pre-booking for the London eye and Westminster Abbey? I hear there are some very loooong queues at these two sights. Also can the verger tour be pre-booked at the abbey?
Please give your valuable tips for us.
Thanks