Just a few points to clarify, as I've been recovering and missed a few things:
In BBC iPlayer on Freesat, the only boxes with the Ethernet port, and hence access to the BBC iPlayer, will be the HD boxes. You won't get HD BBC iPlayer, however, but the menus will look lovely.
In Freeview retune - the results I neglected to add that in Wales, S4/C and E4 swapped places. This gives S4/C coverage on all transmitters in Wales, with E4 only on the full-service trasnsmitters. Given there is only one Wales version of Channel 4, I don't quite see why Channel4+1 could not have swapped.