Britain's high-speed rail line HS2 could concentrate more of the top managerial jobs in London rather than spreading well-paid work across the country as politicians hope.

Managers will no longer need to be located as close to workers and major sites, and can instead live in London near big corporate headquarters.

As a result, the capital can expect to increase its dominance of UK business life, according to an economic study of the French high-speed rail system.