We spent a day in London in the summer, and did so much. One of the things two of my children did was go on The Starflyer. I have to say, my mum instincts kicked in and I wasn't completely at ease as they went up, as it was so high. Here's the history.
They loved it, really loved it. I can't imagine going on it.
67 metres up! On what look like flimsey chains. Shivers*