In France it is quite common to have TWR+Radar together at quieter airfields and at night in bigger ones. I think they even do it on occasion in CDG.
As a pilot, if there is only one controller available at an airport I would much rather the airborne service be radar based than procedural thank-you-very-much. Other places in the world, when a radar picture is available even FISOs will have one and provide traffic information, but for some reason this is impossible in the UK
