MS FS2002 is OK, if you're using the UK Photographic Scenery package, which can help with VFR navigation / map reading practice - I've used it many times for checking out routes before flying them for real and it has been exceptional - however, it is only as good as its up to date accuracy and there are no plans to issue new photo patches as far as I'm aware (my own area has changed a fair bit recently). You also need a fairly high end machine with exceptional graphics for it to be of any benefit.
Check out:
www.visualflight.co.uk
Apart from this personal note, the earlier replies are on the ball.