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Wiring is simple - make sure you have good quality scart leads with the full 21 pins (some don't have all the necessary wires).
STB #1 > TV #1
STB #2 > DVD in #1
DVD out #2 > TV #2
To see / record the STB output on the DVD simply tune it to the AV channel.
your DVD will not be able to autotune anything unless you daisy chain a standard coaxial aerial, with a terrestrial signal (or perhaps an analogue bypass from the cable). ie. rooftop aerial > DVD > TV