The Not Going Out star will play Bladings Castle's long-suffering butler Beach in the BBC One comedy, based on the stories by PG Wodehouse.
Timothy Spall and Jennifer Saunders will reprise their roles as Lord Clarence Hemsworth and his sister Connie, respectively.
Harry Enfield, Celia Imrie and Mathew Baynton will be among the second run's host of guest stars.
Julian Rhind-Tutt, John Sessions, Daisy Beaumont, Zoe Boyle, Michael Brandon, Nichola McAuliffe and Jemima Rooper round out the guest actors.
Blandings' second series will see Clarence looking to spend more time with his pig The Empress of Blandings, and facing the risk of being committed to an insane asylum by a guest, among other stories.
Writer Guy Andrews said in a statement: "As ever, all Clarence wants is to be left in peace with his beloved pig. But events conspire against him as never before. His incorrigibly rakish brother Galahad is on the prowl with a glittering monocle and a case full of shocking memoirs.
"Other guests and impostors include a voracious Hollywood producer, a dancing saxophonist secretary, Clarence's frankly terrifying sister Charlotte and - worst of all - the poker-wielding Duke of Dunstable, the rudest man in Shropshire. Will tranquillity ever reign at Blandings Castle, even for an afternoon?"
Blandings is expected to air on BBC One in early 2014.