LONDON — A world premiere, a new version of Spanish classic “Damned by Despair” and a major revival of Howard Barker’s provocative “Scenes From an Execution” have been added to the National Theater’s 2012 slate.Jeremy Herrin will helm “This House,” a new drama about the machinations of politicians set during the political/economic crisis facing the 1974 British government. Starring Phil Daniels, Philip Glenister (“Life on Mars”) and Julian Wadham, the production is designed by “War Horse” creatives Rae Smith (sets and costumes) and Paule Constable (lighting). Previewing from Sept. 18, the production runs in rep. to Dec. 1 with a Sept. 25 opening. Fiona Shaw (“True Blood,” “Harry Potter”) stars as a fictional artist in 16th century Venice in Howard Barker’s “Scenes From an Execution,” a stage play originally written for BBC radio. The production, helmed by Tom Cairns and designed by Olivier-winner Hildegard Bechtler, previews from Sept. 27 with an Oct. 4 opening. Bertie Carvel, winner of this year’s best actor Olivier for his showstopping Miss Trunchbull in “Matilda,” Sebastian Armesto and Amanda Lawrence (“Brief Encounter”) lead Bijan Sheibani’s production of Tirso de Molina’s 1625 drama “Damned by Despair,” one of the most famous plays of the so-called Spanish Golden Age. Previewing from Oct. 2, the production opens Oct. 10. The NT has also announced that Nicholas Hytner’s NT, West End and Broadway hit comedy “One Man, Two Guvnors” will embark on its second U.K. tour commencing at Leicester’s Curve theater on Oct. 25 and ending at Nottingham’s Theater Royal on Feb 2. This will be followed by an international tour, dates for which are yet to be announced.