This page seems to give a lot of information about what it is:
http://www.thunder-and-lightnings.co.uk/tsr2/survivor.php?id=514
The website would suggest that it is the nose section from Farnborough. Its also interesting that it was made up as a test rig, rather than coming from one of the aircraft.
Its also interesting reading the test made on the rig. Not only the thermal trials, but also bombarding it with bird carcasses for bird strike testing! Lovely! Lets hope they weren't throwing roast chickens at it!