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Difficult to assess at a distance. Sounds to me as though you may be suffering from 'crosstalk' - this is a 'fault' whereby one particular signal (the wanted signal) is being interferred with by another (unwanted) signal. This can happen when the two individual signal paths lie physically close to one another. I'm wondering if the wanted signal is the output of your freeview box and the unwanted signal is the analogue signal of the station to which to tv is tuned to (even though you are not watching it). it's quite normal on a tv for the composite output signal of the analogue tuner in the tv to be present on the scart plugs on the rear of the tv - it can then pass down the scart lead to another device - of course, also in the lead will be the signal from your freeview receiver going the other way to the tv - they are in close proximity in the cable. You say you have good quality scart leads - would it be possible to borrow some others from a friend ? swap leads around? another thing to try is: view a blank channel from your Freeview box and then try changing the analogue channel that the tv is tuned to (you may have to go to normal analogue viewing whilst you change channels - tv's vary about whether you can change analogue channels whilst viewing a scart input) Does the nature of the interference change - this will give you a significant clue as to whether it is the analogue signal interfering or not - it may vary from analogue station to station (try going form bbc1 to itv to ch4) keep us informed, regards, yt.
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