I'm sure lots of people would have wanted them - but the post is just titled "london eye" so could be about anything. Perhaps, "Free tickets for the London Eye." would have had a better response.
Even when we open the thread up, it just says "any body live near the London eye" and another Mayhemer has to guess what you are talking about.
The offer is a nice idea but don't get grumpy when people can't take it up because you haven't told them what is on offer. We can only go on what's written on the screen, unless there are any mind readers out there.