This was one of the highlights of my entire life!!! YES, it was fun. The wheel is 450 feet and takes 1/2 hour to ride, but it's worth it. When you look at it, it doesnt even seem to be moving because it's so slow.
When you get to London you need to make a reservation for a time and pay for it at that time. Cost $12.00US for an adult. Seniors and children get a lower price. You have to get there 1/2 hr before your scheduled time and wait in line. Check the British Air website for times and information. I did it in September, and the hours went till 10PM. In the winter the wheel is in operation only until 6PM. You also need to remember that the sun sets at about 4:30PM in November and December.