I purchased a 6 day pass at 1/2 price for my recent trip to London (unfortunately the offer has expired but I found it on the www.visitlondon.com website) and used it to visit all kinds of places that I wouldn't have seen had I not purchased it.
But to save money at full price you really have to do the math before you purchase, we would not have saved money on my husband's 3 day pass had it not been 1/2 price. It's not as good of a value as the Museum Pass in Paris nor does cutting the queues really add that much benefit.www.londonpass.com

