Oh Nigel, I can't take Briga's question's seriously they're so extreme, life and archaeology is not black and white.......
I was just trolling - FWIW I'm not a big fan of "Polluter pays" PPG16 (but its better than nothing) and I would like to see more open area excavation (it can be much more informative than lots of little holes).
Having dug at Thornborough I was amazed to discover how tremendous a place it was (back in 1999); I'm also a believer in the importance of landscape archaeology (a holistic approach informed by "spirit of place").