Until 1967 the 1214Khz AM frequency was used by the BBC Light Program to be used by filler low power transmitters where the main Droitwich high power 200Khz long wave (long wave was never used for broadcasting in USA AFAIK, it still is in UK) transmitter didn't provide adequate signal, mostly in Scotland. The BBC until then had 3 national networks: The Light Program on 200Khz long wave with low power fillers on 1214Khz AM, Third on 693KhzAM + Low power fillers on 1593KhzAM & Home Service Regional on several AM frequencies. In 1967 the BBC introduced 4 networks, The Light became radio 2, third became radio 3 & Home Service became Radio 4. Radio 3 & 4 Frequencies remained the same as Third & Home. Radio 2 got 200khz long wave + 1484KhzAM for fillers. The new pop station Radio 1 got 1214KhzAM as a shove in & had to make do with a single frequency network. Of course it all changed again in 1978, only that was a lot more complicated, wouldn't want to bore you with that.
