It is not possible to provide the information exactly as requested. However, the International Passenger Survey can show the number of passenger trips to Paris and Brussels made by air (from London and other UK airports) and by train (Eurostar). The number of trips to Paris and Brussels by road is not available.
Thousand Paris Brussels 2002 London airports 901 362 Other UK airports 1,183 478 Train routes 2,391 599 2003 London airports 872 305 Other UK airports 1,333 375 Train routes 2,303 648 2004 London airports 824 328 Other UK airports 1,328 367 Train routes 2,628 736 2005 London airports 784 293 Other UK airports 1,324 348 Train routes 2,732 758 2006 London airports 800 263 Other UK airports 1,315 339 Train routes 2,745 811 Notes: 1. London airports cover Heathrow, Gatwick and London City. 2. ‘Train routes’ include Eurostar foot passengers from both Waterloo and Ashford. Source: International Passenger Survey (ONS)