AM,
EGCA was making comparison between sizes of fields/runways and, if or not, scheduled services.
Had it not been for Bill Bryce and Brymon Airways Roborough (more recently known as Plymouth City Airport) might have remained a 3 grass runway'd field with the biggest things operating to/from it being Twotters.
Staverton (more recently known as Gloucestershire Airport or whatever) doesn't have a Bill Bryce nor a Brymon Airways nor a remoteness from other scheduled service airports that Roborough had back in the 1970's.