Nearly 70% of 3m newly registered voters are under 35 — but few are in marginal contests

Jeremy Corbyn’s hopes of benefiting from a last-minute surge in newly registered young voters may be dashed, research by The Sunday Times suggests.

Almost 3m people have signed up to vote since the election was called on April 18, figures show. Nearly 70% of them are under 35 and more than a third are under 25, groups that strongly favour Labour.

On May 22 alone, the last day of registration, 622,000 people enrolled to vote, of whom 453,000 were under 35.

A constituency-by-constituency analysis of the surge suggests that it has occurred disproportionately in safe seats where it will increase the votes for Labour without changing the outcome.

In only a few cases — including the Hastings and Rye seat of the home secretary, Amber