[russell_w_b]

200kHz until 1945. The 200kHz frequency was transferred to Droitwich and Ottringham then broadcast on 250kHz. But the second harmonic interfered with the maritime distress frequency of 500kHz, so the frequency was changed to 271kHz in September 1945.

A few weeks later the frequency was changed to 167kHz with a power restriction of 200kW until the Copenhagen Plan of 1950, after which it was 200kHz, but outside domestic broadcasting hours.