My friend and I took a six day pass. We certainly saved money as entrance fees have risen steadily. Once we activated the pass [i. e. used it the first time] we had to keep moving to get the full value of the pass.
We were in London for two full weeks and wondered for our next visit if there is a possibility of a pass that could be used over a two week period that included specific sites.
[Not all sites had a dedicated line for pass holders so you could not "jump" the cue }
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