Mansion House speech: George Osborne presented with GCSE maths book She added the working title of the programme was We Know Where You Live, and it would air in late summer or early autumn. The stunt appeared to unsettle the Chancellor, who was with Lord Mayor Alderman David Wootton. Onlookers said the episode was filmed on a small documentary camera before the crew was bundled out. A similar stunt earlier this month at the National Gallery was also claimed by BBC Three. A crew member hung a copy of Constable's The Hay Wain on the wall of room 35 in the gallery in Trafalgar Square. At the time, a source told the Evening Standard: "That someone was able to hang it in room 35 reflects the cuts that have been made in warders. It is impossible for one person to cover multiple rooms as there are too many blind spots. The policy of doubling up rooms will eventually lead to something more serious. Prowse - who hit the headlines in 2009 after covertly filming Conservative politician Alan Duncan saying MPs had been "nationalised" - and Rubinstein became internet hits with their satirical work for Don't Panic Online.