THE SNP’s leader at Westminster has invited Jeremy Corbyn to a new year cross-party summit on retaining membership of the single market and customs union.

Ian Blackford said safeguarding membership would protect jobs, incomes and workers’ rights from the “catastrophic damage” of an extreme Brexit.

His party, the Liberal Democrats, Plaid Cymru, and the Green Party are all committed to remaining in the single market and customs union despite Prime Minister Theresa May ruling it out.

The SNP believes a parliamentary majority to retain membership can be secured if Labour back cross-party plans and are joined by Conservatives in favour of a soft Brexit.