It works - just about
Got a weak signal off one of the 5W analogue channels, after a bit of tinkering. Had to set the lnb frequency to 10600, and detune the receiver as the BSB LNB lo frequency is 10770MHz. This of course puts the tuning way out, but I got a definite confirmation of Canal+ before the encroaching cold drove me back inside.
More tinkering when the weather warms up a bit!