I've got a Topfield PVR, and after two attempts at retuning I'm a little concerned that I might lose some channels. Dave and Dave+1 appeared at channels 1006 and 1008, but there is a message superimposed on the screen saying that they are relocated lower down, so I should retune. However, after two rescans, they are still stubbornly at 1006/8. Doing the same on my TV set (which has its own Freeview tuner) results in those channels being relocated as they should be, so I fear that the Toppy will lose them.