Air travel was very different then: the routes at Gatwick were different, with much more intercontinental travel, air passengers carried more luggage, and it wasn't in suitcases with wheels.
Part of my extended family was a perfect case study in the growth potential and threat to the bottom line of that era. The husband worked abroad but wanted his whole family out there (wife and two kids), but they would come back for every break in school and more, with some trips resembling an actual expedition in terms of luggage.
They were representative of a growing ability of UK plc to make money by exporting home grown talent and family values without said talent actually emigrating to adopt the values of a foreign land. A provincial family with no privleage beyond that which comes with hard work and intellect, never once claiming benefits and with both parents in work, their betterment of course still assisted through the helping hand of the state via free education and health, which of course was now getting its money back and more through good old taxation.
Hardly the dream of Neil Kinnock or Kier Starmer. Thatcherism on steroids. There is no such thing as society. But community is a thing (the oft ignored second part of that infamous speech). They could not have done what they did without their domestic community, centred on extended family, and their ex-pat community.
Having been newly privatized, the regional airport just a short taxi ride up the road was doing gang-busters, so was an obvious means of getting to London, for their intercontinental flight needs. Yet they were also a short taxi ride from the main station, offering fast and frequent IC services to London.
The initial taxi ride is therefore equal.The hassle of having to check in twice and the doubling in risk of lost baggage, compared favourably with the hassle of a taxi transfer between London terminals. The journey time from door to intercontinental plane seat, favours the regional airport but is reflected in the still very large difference in cost.
They are doing well for themselves, two cars and a big house, but they're not rich or stupid. The mother in particular, being of working class stock, is acutely award of how much a pint of milk and a pair of school shoes costs, despite now being treated to top notch jewellery for Christmas. Since the journey will take a day either way, and will be an epic hassle either way, she would rather have the jewellery than the time.
This was exactly the sort of existing and future custom that the renewed focus on offering that sectorisation theoretically brought that could and should have retained and grown. It was not to be. Privatisation narrowed the view, and failed to deliver the savings that, in the airport and latterly car hire sectors, only continued their downward trajectory into affordabiliy.
I also regularly used to travel to London. Not for nothing did I proudly display my models of Easyjet planes as a reminder of their superior cost, time and convenience of air travel over both rail and car. My BR blue and IC grey model trains, not so much.
Post-9/11, and then post-Covid, air is less appealing, as is private or hired cars. And yet even now, the train struggles to look attractive, even under normal conditions. Throw in militant greedy staff and a quite literally unreliable service which is only cheap for those whose travel plans can be predicted months in advance, and they can frankly screw off (all except certain open access operators whose minds are still very clearly on the customer and their growth potential, just as Thatcher would have wanted it).