Ah, right! Here's an approximate comparison then, measuring from one of the terminus stations serving central London, according to railway timetable data: 0h 3

Ah, right! Here's an approximate comparison then, measuring from one of the terminus stations serving central London, according to railway timetable data: 0h 30m - Heathrow 1h 00m - Gatwick 1h 00m - Luton 1h 30m - Stansted 2h 30m - Manchester 3h 00m - Birmingham 3h 00m - Bristol 4h 00m - Cardiff Plus Channel Tunnel trains: 2h 00m - Brussels 4h 00m - Amsterdam Looks like I was wrong about Manchester being further than Cardiff though!!