[Steve in Pudsey]

Yes, they used UK Gold and UK Livings audio subcarriers, those being the neareest the BBC had to satellite services in the analogue days. 

Radio 1 and 2 were stereo on one and the rest mono on the other (a stereo service taking up the equivalent of two monos). 

The Radio 5 feed was used as the backup (RBS) source for the AM transmitters, so the network operated on a delay to match the satellite so that if one transmitters went onto that backup it would stay in sync with others on the same frequency.

This meant that things like radiocar contributions couldn't use the typical off-air cue feed for the reporter or guest's headphones.