The old HQ is virtually all demolished, the radio mast still stands waiting to be moved to its new ‘home’ in the grounds of the new HQ.
The video from the vaults of the BFI shows the mast being built in 1968, great to watch and have a look at the workmen's clothing !! (No Health & safety in those days)
Interesting to see it being dismantled and then rebuilt ?
From Britain on Film available at BFI Player