Hey, I think I found out, what "TV 4" refers to: BBC Four. Did BBC 4 exist back then? What kind of channel is it? Their website left the impression, that it must be some kind of Love-Story-channel.
BBC4 is about 3 years old.
BBC3 TV is about 5 or 6 years old.
BBC2 TV started in 1964.
BBC1 TV started in 1936.
1928 Experimental television transmissions.
1932 Experimental radio transmissions.
BBC formed 1922.