I agree with pprune tower. i have FS98 as well as fs2004. I bought and addon for fs98 called Koch VFR scenery england and wales for about £5. It can be used for vfr navigation, it has most features on the 1/2 mil map and airport scenery is the spot on, if its in pooleys then it will be on the game. Airports like Coventry and oxford are very detailed. The good thing is that it runs smoothly unlike fs2004. FS2004 has real weather and slightly better a/c handling as well as flight analysis which is good for monitoring IFR procedures.
I got x-plane 5 for about £2. the aircraft handling is excellent compared to fs2004 and the performance is better, even though it lack a lot of the features of fs2004.
Capt. M