I actually worked in that laboratory and can tell you that the rooms in question were
not used for acoustic testing but had other RF uses. If you are interested I suggest
you look at the QinetiQ website to see what they were really
QinetiQ were the government owned company who sold the site for development who owned
the majority of the labs there.
That lab was the biggest of its kind in Europe and cost the the taxpayer some £10m to build in the mid 80s.
It was effectively levelled at a complete loss to the government."