From the Lodon eye web site
Equipment
As well as being the UK's most popular paid-for visitor attraction, the London Eye is also a very busy site for media activity - one of the busiest in London. It is chosen as the location for many different reasons with the most popular of all being for pleasure. We also facilitate commercial projects, educational projects and opportunities that promote tourism for London and the UK.
We encourage filming and photography on many different levels including onsite photography exhibitions, photography master classes and student film programmes.
As a way of managing these projects alongside the visitor experience, like many other visitor attractions, we have in place some guidelines and equipment restrictions. Please note that the London Eye reserves the right to question or
restrict items that are commonly used for professional purposes.
Photography
Restrictions apply to some types of photographic equipment. This will include (but is not restricted to): multiple lenses, long lenses and tripods. Those wishing to board the London Eye with any such equipment are advised to first contact the press office.
http://www.londoneye.com/NewsAndEvents/Press/equipment/default.aspx