//Well, Glasgow / Edinburgh / Aberdeen / Birmingham / Doncaster / Heathrow and Gatwick. So not really 'most' or 'large'.//
Why is the simplest of comments so contentious?
The eight busiest airports in the UK are Heathrow, Gatwick, Manchester, Stanstead, Luton, Edinburgh, Birmingham and Glasgow. These eight (out of 40 sites recognised as "airports") cater for 80% of the country's passengers and 60% of aircraft movements. Wetherspoons has 13 establishments spread across six of them (with none at Manchester or Luton). So I would say "most" and I would say "large".