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Presumably the av sender uses a scart socket connection?
Wiring should simply be:
Sky scart #1 > living Room TV scart #1
Sky scart #2 > Av sender scart sender (STB) unit
AV sender receiver (TV) unit > 2nd TV scart #1
Positioning of the sender's receiver may prove important so you have line of sight with the remote controller. You'll then have to look at how the sender unit connects the remote signalling to the STB.