The BBC America doc The Ultimate Guide showed heaps of new clips but the one that's got me stumped is this one:

http://blogtorwho.blogspot.com/2010/...s-preview.html

It's at the start where the Doctor is using his Sonic on a gate. Any ideas what episode this is from?

None of the ones shown at present. So got no idea.

Some seem to reckon it's from the "Silurian" two~parter.

Amy does seem to be dressed the same as other pics/clips that are from the Silurian episodes.

Good shout.