I went to London with my daughter and it was very easy in use. You should go at least three or four days because otherwise it's a waste of money. You don't have to wait in line to see most of the museums or attractions. Unfortunately we had to buy seperate tickets for the London Eye, we had priority with the pass so within 10 minutes we could go inside even though there was a very long queue. We did had to wait at Westminster Abbey, which we didn't quite understood. All together you're cheaper off if you'd like to visit a lot of things.
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