As well as the Mark IV anything refurbished or moving since the early 200s and until ViLor got Calrec digital desks. These have all been replaced by ViLoR but in sites like Nottingham, Leeds and Hull would have been installed a the same time as the TV installation.
It's not just the Beeb BTW, I think Belfast's ILR Downtown Radio (lost track what it's called now) were still using their original 1976 desks into this decade ?
Still called Downtown Radio. They have a sister station Cool FM which replaced Downtown on the Belfast FM frequency in 1990, while Downtown continues on AM in Belfast and FM across the rest of NI.