How Do You Book Hop On Hop Off London England Buses? Tips + Things to Do?

[sightseeingo]

Hey everyone,
I'm planning a trip to the UK this summer and will be spending a few days in London . I've been reading about the hop on hop off London England bus tours and they seem like a great way to see the main attractions without stressing over public transport.
Has anyone booked one recently?

I'm wondering:

• What's the best website or app to book from?
  
• Are there different routes or operators to choose from?
  
• Any tips for using the service efficiently?
  
• Can you combine it with entry to places like the Tower of London or the London Eye?
  

So, while we're on the topic—what are your must-see spots or things to do in London for first-timers? I've got the basics like Big Ben and Buckingham Palace, but curious if there are any lesser-known gems or day trips worth taking too.

Appreciate any advice from locals or fellow travelers! ?
Thanks in advance.

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[Gazza]

Es ist zwar Werbung - der untere Link führt auf eine Seite, die so heißt wie das Profil - aber ich lasse es mal stehen.
Eine Beantwortung der Fragen ist allerdings unnötig.