With green issues the order of the day it's time for BBC Four to do its bit and put the corporation's unwanted footage back into profitable use. Watch out for Ming Campbell, David Cameron, Barry Bucknall, Tony Hart, Andrew Marr, Anne Robinson, the Wombles, Kate Winslet, the Pope, Tony Blair, George Bush, Patricia Hewitt, John Prescott and Cliff Richard in this all-star gala mash up that signals the return of Don't Watch That Watch This, the show where 98% of material is suitable from recycled sources.