Absolutely Terrific
We have our London Passes bought (incredible savings if you visit three sights in a day), and is that were not awesome enough, the London Pass App is terrific! With street maps to your destinations, tube maps, bus maps, and several different ways of organizing the places you want to visit (by neighborhood, favorites, etc), this app has taken the place of THREE other apps for our trip. Love it.
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London Pass - Travel Guide