The airfield is located someway from the centre of London, and the M3/A3 is by no means an easy motorway to use in peak times of traffic, so marketing Farnborough to a major London based business customer would be difficult. There is also the lack of public transport connection (although I am happy to be put right on this point since it has been some time since I last visited there)
One of it's main features is that it used to be a military base and has good security, so in the light of September 11th this would be a good selling point.
Only time will tell as to whether Farnborough makes it big in the GA field. There are lots of airports around London all competing for a very small amount of business and each one will have to go out of their way to get the business. I think it's the quality of the handling, the level of security and the out-of-hours service that will win at the end of the day, and Farnborough must be a major contender.
I wish them well (although working at Stansted not too much...!!!)
Best regards