We're toying with idea of getting train to Montpellier for holiday there, rather than flying. Flights seem to be with Ryannair for complete rip off (£900 for family) or Gatwick so a trek across London, whereas St Pancras is just 30 mins away. The twins are 6. The leg to Lille will be fine but what about the 4 hr bit down to Montpellier? We've not done long train journeys before, and in the car rely on playing games / talking books.