I am trying to schedule the very last bit of my Europe trip. My flight leaves Heathrow at 1:40 in the afternoon (13:40, must get used to that 24 hour clock!). I'll be in Paris the day before. If I take the Eurorail, there are two morning trains. I can get to St. Pancras at either 9:30 or 10:39. If I took the later train, would 2 hours 50 minutes be long enough to make my flight? The tube schedules say it takes about 1 hour on the Picadilly line to get to Heathrow, but I don't know if I'd also have to go through customs at St. Pancras (I'm assuming yes) or how long that would take.
The extra hour would help me feel less anxious on the Paris side!
Any suggestions would be appreciated. Thank you!