['LIVEWIRE?']

Not sure whether it's an Image frequency or what, but there is a 2 or 3kHz beat note on Radio Gloucester 1413kHz, which at this location is a strong signal from a transmitter at Bourton on the Water about 8 miles away. I thought maybe the beat note was due to an oscillator harmonic from 945kHz, but there is no station on this freq. nearer than London, thus no signal strong enough to cause this type of interference. No other Radio I have tried exhibits this phenomenon, and CAREFUL adjustment of either the IF or Osc. circuits doesn't cure it. What might be the cause? The radio is the later model with AF117s, which I have replaced with AF139s

(PS I was going to use amateur radio terms such as 'QTH', 'QRM', & 'QRG' for location, interference, and frequency respectively. Would these be acceptable in future?)