Not sure how possible this would have been technically at the time. I might be wrong, but wasn’t Oliver’s Mount (and possibly Sheffield too) a relay of Emley Moor until DSO?
Looking back through my archive of BBC and IBA transmitter data, Oliver's Mount was always a relay of Belmont for BBC 1 and 2, but for ITV/4 it started life as an Emley relay however at some point between 1991 and 1994 was transferred to Belmont. I suspect when YTV started doing split news and ads on Belmont ? It opened in May 1975, perhaps the IBA wern't sure at that point whether Belmont would end up back under Anglia, so to future proof it they tied it to Emley. I assume the BBC chose Belmont because reception was marginally better from there.
Sheffield was an Emley relay for BBC, YTV, and 4 until YTV launched the Sheffield news opt, when it became line fed.
It seems to have remained an analogue relay of Emley for BBC and C4 right up until DSO.
Pre and post DSO, both Oliver's Mount and Sheffield were line fed for their DTT
transmissions for all muxes.
Spencer For Hire gave kudos