The second plane is a Jet Provost. A friend of mine is part of the group of pilots that restored/owns those two aircraft and they have a MiG-15 and a Jet Provost and are looking at getting other jet warbirds as well. I'm quite certain of this as I've seen pics of both aircraft he took.
I showed my friend this map and he told me that it's very likely that he's the one sitting in the cockpit of the Jet Provost in that shot as they were testing its engines. There is a ground power unit hooked up to the jet that you can see in that shot that they used to test the systems after they'd restored it.
http://en.wikipedia.org/wiki/Hunting_Jet_Provost
http://www.airliners.net/open.file/0568886/M/