Councils have been urgently checking their electoral registers after being told to install a last-minute software release.
The issue means scores of people who did not apply before the 26 November electoral registration deadline may have been wrongly informed that they can vote at the election, forcing councils to reprint their polling station registers after installing a software update.
An email from Xpress - one of four electoral management systems in the UK - told councils to cancel any incorrectly issued postal votes and ‘urgently contact anyone who has been wrongly informed that they can vote at the election on the 12 December’.
An Electoral Commission spokesman said: ‘We are aware that some local authorities have been impacted by a software issue that has resulted in a small number of people being wrongly informed that they can vote on 12 December.'
