You need to be properly ambulant for most of these tours as you need to descend/ascend the emergency stair cases for all other than Charing Cross & 55 Broadway. Usually hundreds of steps down & up. Obvious really, but its surprising the number thinking the escalators/lifts still work.
Indeed. A further quote from the site I linked to; I would hope people would read carefully what they're buying before they sign up for a ticket at up to £100.
Access: Each member of your group must bring a photographic proof of ID along with their ticket to be permitted entry. This is for security reasons. There is no step-free access to any of the above tours. The tours all involve walking and may involve long stairwells (of up to 180 steps), static escalators, low lighting and uneven floors underfoot. Hard hats and torches will be supplied where necessary.
