@izzythepush,
I was going to Bury StEdmunds and had planned to fly to Heathrow. I figured out it would take about 2 1/2 hours and cost little over 60 pounds by
trains, bus and taxi. Not calculating problems with the tube.
Flew to Stansted took a taxi and it was 70 pounds and took less than an hour.
And so much more comfortable.
Had about the same experience regarding Dartford. Trains did not run the day when I flew back. Had to take a taxi from Dartford to Heathrow. Faster and not much more expensive than going via London.
This time I flew to Edinburgh took the bus to Glasgow. Fast, cheap and perfect.