By coincidence the CAA's annual traveller survey was published today. Part of it concerns the way passengers reach UK airports.
The capital had the highest proportion of passengers travelling to the airport by public transport, at 34 per cent. Private cars were the most popular mode of transport across the UK: 44 per cent in London, 74 per cent in Bristol and 57 per cent in Manchester.
The airports surveyed were Gatwick, Heathrow, Luton, Manchester, Stansted, Birmingham, Bristol, Cardiff, Exeter, London City, Liverpool and Nottingham East Midlands.
WHBM
SOU has a rail station and CWL is getting one next year, albeit I think it will be about a mile from the terminal and will need road connections.