What mode transport would you recommend for a 3-3.5hr journey one way?
Train
cons: expensive (£70 at least), fixed time, variable temperature, have make a costly trip across London to connect to it, after arrival have to walk or pay for another connection
pros: scenic, can work (read, write) for 1 hr 45minutes, or rest, reliable
Coach (Flixbus)
cons: fixed time, relatively infrequent, have to travel across London to get to it
pros: very cheap (typically £5), cosy (I imagine), scenic, can work for 2 hrs 20 minutes, drops me right on campus!
Car
cons: 2nd most expensive option (£45 of petrol there and back), must be well-rested, will age car, cannot work obvs.
pros: flexibility, door to door journey, warm and cosy, can sing or chat, cheap parking/free parking, can explore the host city
I stay overnight then travel back to London the next evening. It is not unusual in my sector (academia).