If you are a British Flight Simmer running FS2002, FS2004 you need to get this series from Just Flight. Together with the Just Flight Photographic Scenery Series, these British Airport's really do make a very vast difference to the simulator's default airports already shown in the sim. Not only do the Airports look much better, they also have many parked aircraft and service vehicles as well. Even the car parks have vehicles shown, which makes each airport look as though you are not alone. The smaller airfields have not been left out neither, they too have a few planes scattered here and there, plus parked cars by the runway verges. The buildings are so much better looking too, than the default items and even the runways look used which all helps to enhance the surroundings at each airport. There are five different volumes in this series, which cover the whole of England & Wales(including the Isle of Man, Isle of Wight & the Channel Islands), with each volume containing around sixty five airports each. This particular volume, East & South East England (Vol.3) is a double volume for the price of one. Other volumes are, Vol.1 Northern England, Vol.2 Central & South West England, Vol.4 Southern England, Vol.5 Wales & West Midlands. The only ones not available are for Scotland & Ireland.
The real icing on the cake is that this sieres has been out now, for quite a number of years and first retailed at around £15.99 for each volume. Now you can pick them up for as little as £2.99 - £5.99 second hand. I have had all the volumes for just under £20 plus p&p, but it's been the best £20 I have spent on Flight Simulator so far. If you can't find them here on Amazon, try Ebay, as they crop up quite frequently these days. Another well worth add on is FS Traffic 2005, which really bring all the World Airports to life, where you can see aircraft landing and taking off at all the World's Airports.
If you run FSX, then there are more updated versions, but if your computer is not up to running FX smoothly, then stick with FS2004 (FS9) and get these add on's instead.