I think I have found the answer but would appreciate confirmation:
A UK free to air receiver will receive several channels as well as UK FreeView.
A FreeView box receives only UK free to air.
It would appear to be different here in France.
A free to air receiver will receive several free to air channels (including UK FreeView) but not the French free to air channels (TNT).
A satellite TNT receiver appears to receive only the French free to air channels.