Page 1 of Loud Buzzing with TV/VIDEO/DIGI-BOX set up

I have a Sony Wega connected to my Pace Digibox with a scart to the "TV output" of the Digi-Box. The "Video output" scart on the Digi-box is connected to my Panasonic Video.

If the Digi-Box is switched to standby and the Video is on, a Loud Buzzing noise is produced.
If the Digi-Box is on and I select the Video`s menu, the same Buzz is produced.
I have tried other connections, but this is the only one I can find which will allow me to record a terrestrial program and watch sky and visa-versa

If anyone can shed light on this problem, I would be very grateful

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All systems have 2 scarts, but the second scart on the TV is taken by my DVD player.

Thanks, Alex.