By Susan Knox Vera star Brenda Blethyn has put viewers’ minds at rest by confirming the future of the ITV show. Earlier this month, the ITV drama returned for its thirteenth series this evening – with David Leon back as DS Joe Ashworth after Aiden Healy star Kenny Doughty quit the show at the end of the recent Christmas special. At the start of the new series, Vera was left alone and without a sidekick but Joe’s return left Vera feeling a bit put out. Asked about the future for the series and if she’ll be back for another stint last year, Brenda gave a six-word answer: “At the moment there’s n…