Until 1965, viewers in both south east Wales and the English West parts of the franchise received ITV on Ch 10 from the ITA transmitter at St Hilary located on Stalling Down, near Cowbridge in south Wales.
The introduction of the UHF transmitter network for ITV, including particularly the Mendip transmitter in 1967, and the start of HTV's UHF transmissions from Wenvoe in 1970, replicated the separation of ITV programme services to Wales and the West.