Cool so one single example that doesn't support your claim and zero interest in discussing it on a wider basis.
Brighton 17p/mile
Battle 22p/mile
Compare to say wilmslow to Manchester (33p/mile), or northwich (29p/mile)
Compared to to people doing one off journeys. London-Southampton 77p/mile, Brighton 46p/mile, Battle 53p/mile
Just give up.
I've proved your "A typical season ticket into London is under 20p a mile" claim wrong multiple times.
Southampton to Waterloo is just about the exception at ~19p/mile if you assume 22 days per month which I think is exceptional.