GotTheTshirt - well how about that!
I watched you load the TSR-2 onto that wagon and I took pics. It was XR220, which is now restored at Cosford, and it never flew. I have more pics which I'll scan and post later, if I can find them, so check back here for the URL. Great story too! Incidentally, it was July 1975!
http://www.pbase.com/image/11475794