Pros
The pay is good, benefits are decent and the Hammersmith building is by the water, so if you ever get the time you can take a stroll down the Thames. There's also a ping pong table and beer Fridays which are great. Oh, and there's also a subsidized canteen where you can get a decent meal on the cheap.
Cons
The company lacks strategy and has poor leadership and middle management. Because of that everybody's pulling in different directions and one team has no idea what the others are doing or they don't care. The company lacks focus. They want to do too many things at once and because of this projects advance very slowly have lots of dependencies and a lot of times they end up half baked or abandoned. So next person who touches that will most likely break something because there are no processes in place and nothing gets documented. There is a very high turnover, and even people at the top leave very fast or disappear over night ;) This causes major knowledge and ownership issues, and it's one of the main reasons why middle management is so poor. There is high pressure to deliver and because of this people pass the buck over email all the time just to give the impression that they've done something. You end up with tens and hundreds of emails in your inbox every day but 99% of them are just noise or deflecting problems, with no real desire to take ownership or actually fix something that's broken. The company does performance reviews every 3 months, which can get political and have very little to do with what you've delivered in the past period. Instead of helping people get better at their job and creating achievable goals, the reviews put useless pressure on employees and allow the managers to be manipulative and perform subjective reviews. I would say don't get a job here unless you're one of the people who just like to pass the buck and then complain about things not getting done :)