I had to travel to London in the mid-eighties to collect a replacement car- mine was badly damaged. (I have been there since ) A number of people boarded the train at Doncaster, and clearly from their conversation they travelled together on this train every day. They commuted regularly from Doncaster to London for work. Presumably property was/ is still miles cheaper in Doncaster than in and around London. The train only takes 90 minutes from Doncaster to Kings Cross. So I suppose compared to travel times from "the Home Counties" it made/makes sense. What I wondered was is it still the case today or has the escalation in rail fares made it no longer an economical proposition?
Back in the early 2000's I regularly travelled from York to London on the train for meetings - maybe twice a week - there was a hardcore of about 20 who were on the 7 o'clock train everytime I travelled on it.