HP4U has been sent 9 new pictures taken outside Leavesden Studios of the sets being used inside the grounds. These are courtesy of a member of their forums, Jess and all 9 can be seen here (you have to scroll down a bit to see them.)

the dragon lair and quidditch stadium

stadium up-close

tents & Union Jack flag

Knight Bus

out-doors CGI green-screen

trailers

Source: HP4U.