Series 7 has extended/remastered episodes of Tikka to Ride, Ouroboros and Duct Soup, there's also lots of deleted scenes.
In fact all the seasons have a good deal of material that are perfectly good (not screwed up lines) but clips deleted mostly for time or pacing.
Series 8 of the new discs has extended/tv movie length versions of Back in the Red and Pete (the multipart episodes extended and cut together as single long ones).
You'd have a lot more to work with.