Get Your Guide is a great tool. I literally bought the fast track tickets in the line as I was waiting to get on to the London Eye. I had a 1yo and 4yo, the 1yo was free but unfortunatley 1 had to what I felt was a steep price for my 4yo. The London Eye is great but a AUD $200 ferris wheel ride... that is really steep. I would not go on it again. It is so slow that 4 minutes into my 4yo wanted to get off as she thought it was boring. It takes about 20 minutes to do the full loop. Views are lovely but everyone gets over it half way.

The ride started on time, we were first in the fast track line and first onboard. The ride itself and the views were great. Unfortunately we had a few light showers during the ride which spoiled some of the photo opportunities but so be it. It was a great experience.

even though there is a bit of chaos before the entrance because of the huge amount of people, stuff was friendly and helpful and a digital announcement helped to queue at the right time; one can see main attractions like Big Ben and an overall view, but there was not something really special to see; a lot of people in the cabin so it was hard to see different sides of London without "losing" a place at the window I would recommend it if you want to see attractions from above or in a more quiet way, but for me it wasn't special or a 'must do' when in London since you can see the things in a better way on the ground