Used 1day London pass a few years ago. At the time it included hop on/off bus and boat.
We targeted Tower of London, Westminster, tower bridge along with hop on/off bus/boat. Started as early as we could. Didn’t feel rushed.
We used Chase credit card points to buy passes so didn’t cost us any actual money.
Very happy with choice and value.
My kids loved Wicked as well. Probably their favorite.