Josh, I disconnected my cable co-ax from the satellite box, but hum remained, so not that ... thanks for suggestion.
Well, I got rid of the hum. Unplugged Mr T from the Belkin PF60, and plugged it (him?) to a second socket on the same double outlet to which the Belkin is connected, and hum totally disappeared. However this means the precious green boxes now don't have overload/surge protection other than the switchboard RCD so I will need to do something about that!
Thanks for the help ... will also get a cheater and test that option out of interest.
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