HA HA!
Have now installed an SP1 smart priority switch as a partial solution to my single feed problem (stupid communal dish system).
Works!
Box turned on - priority given to LNB1 for watching (& live pause/record etc.).
Box on standby - priority given to LNB2 for unattended recordings.
And also... it acts as a splitter too. Does decrease the signal strength, but seems acceptable. So I can actually also watch/record one channel while recording a second channel, even though I have only one feed [limited to both channels being the same polarity & band though].