[bubblegun]

Did the Sharp just use a short co-ax cable from the RF1/2 outputs on the back into the co-ax aerial input on the tv ?

If you connect both cables - the co-ax and the SCART then you should be able to troubleshoot it as to why one is working and the other isn't.

You should put the Toshiba into analogue mode then manually tune it to channel 68. This should allow you to see the Sky on the Toshiba.