Spymaster
Plastic Paddy
In Kent? You would just go to Ebbsfleet or Ashford.
Not now mate. Both still closed. See above.
The wider point stands anyway. In these discussions people tend to consider trains to operate door to door, whilst aircraft operate from airports which are time consuming and expensive to get to. It's a very London-centric view. Tell someone in the North or West of England they should get the Eurostar to Paris instead of flying from Newcastle or Bristol, they'll laugh at you.