On the official site of London Eye, you can buy online tickets that are 10% cheaper than tickets book directly at the location.
If I buy a standard ticket, do I have to specify a date or even a time when I want to visit it? Or can I order a time range? There is also the possibility to buy a fast track ticket. It is almost 9 GPD more expensive than a standard ticket. Are the queues really that long that it would justify such a a huge amount of money?