Fears that students may have voted twice to boost Jeremy Corbyn's election result have prompted the Electoral Commission to demand urgent action to halt a "troubling" rise in alleged voter fraud.

Ministers should investigate developing a new computer system to block duplicate voting and force electors to choose where they will cast their ballot, the commission said last night.

The watchdog revealed it received over 1,000 complaints and almost 40 letters from MPs about voters casting more then one ballot in June and it is working with police on how to investigate the claims.

It highlighted evidence showing students are most likely to be registered in more than one place and that thousands more than expected registered to vote in the 2017 ballot which saw Labour boosted across the country.