Strugling to find many details on Houghton Grange and only being small number of reports online, from what I do know though is The facility was a government owned animal testing facility. The site is pretty secure with high tech wizardry cameras and the main building itself appeared to be under redevelopment so we were unfortunately unable to gain access, however a large number of outer buildings were accessible and have been pictured.
Afraid to say, I think we missed the boat on this one!