An earlier medium wave transmitting station is Brookmans Park, also in Hertfordshire and built by the BBC in the 1920s.

This changed in 1972 with the Sound Broadcasting Act [4] and the IBA let two contracts for commercial radio in London, one for "news and information" and one for "general and entertainment".

There were two input feeds - one was a single Tariff M music circuit from the studio, and provided by the Post Office.

[13] Saffron Green has a line of four mast radiators 71 m tall and 61 m apart at an angle of 161° ETN .

[14][15] In September 2020 one of the masts in the array was struck by lightning which damaged the antenna tuning unit.

[1] In 1987 the IBA required stations to stop simulcasting on AM and FM and to provide different services.