Enjoy the train(s) to Southampton -Lovely on those four and five car Voyagers with the tilt turned OFF and stopping at every point conceivable and some not so down the Chiltern and Oxford line and reversing in Reading really takes for ever !
Unless you route via London and navigate the murky and at the moment most unbearable underground- I can tell my own commute home today really was hell !
As for Edinburgh I suppose you travel via York and a change to that “ can’t make any money” franchise East Coast because TPE can’t run a proper service !
Heyho each to their own.
Personally I’d get in the car book a Premier and take in few more customers in both cases.
Again I’d say a fourty minute patient queue seem far more appealing.