Yes the Gatwick is not ideally timed for the business travellers, but I think it is aimed more at a leisure market at the moment with the morning flight on a sat with the evening flight on a sun giving people the chance of an night in London. Also how many people will use the Heathrow to fly down and then use the later Gatwick flight to fly back from London?
NCL people remember that Stansted was originally only done once a day to start with with GO and now look at it.
Also if they do base a second aircraft at MME I think a second Gatwick will probably be on the cards.
Will the Heathrow stay at 3 flights this winter with the introduction of the Gatwick and if so the airport has actually lost 1 flight a day.