"I'd wager it may be Cambridge Audio"
I thought that too.
None of the other brands looked anything like it. I tried comparing a few images from Akai, Aiwa, Denon, Kenwood, JVC, Sony, Technics. None seemed to match.
It being the BBC, the props department might have tweaked the fascia panels (covered up logos and brands) as they have a policy of non-advertising, since their funding comes via the licence fee, paid by the viewer.