That's Brighton to Milton Keynes, Basinstoke to Colchester, Canterbury to Oxford keep to the Fen Causeway
The London catchment area is bogglingly huge. People commute from all kinds of insane places, usually because of property prices.
Someone else I know commutes from Newcastle to Reading for the week - around 300 miles - and then back again at weekends. By car.
Also, there is a new phenomenon of tax evaders who have residency in Belgium, while working in Paris. Un roi sans divertissement est un homme plein de misères