Around 14,000 voters were denied a vote at the local elections as they didn't have the right ID, the first official figures show.
Analysis by the Electoral Commission found thousands of people were turned away from polling stations due to the Tory voter ID crackdown which came into force last month.
The watchdog found that 0.7% of people were blocked from voting as they didn't have photo ID - but around two-thirds of them returned later in the day and were able to vote.
