debit

The proportion of adults regularly using physical contactless cards dipped slightly as a result, although debit cards remain the most popular way to pay.

Sultana had promoted the membership portal on social media but Corbyn later said the emails were "unauthorised" and should be ignored, while any direct debits set up should be "immediately cancelled".

From 1 October, the charges will typically cost 53.68p a day for electricity and 34.03p a day for gas for those paying by direct debit.

But Corbyn posted a statement signed by four other independent MPs involved in the party in which he claimed the emails were "unauthorised" and said any direct debits set up should be "immediately cancelled".

They urged backers to ignore the message and cancel any direct debits that may have been set up.