LL34, if you visited the tower at LHR I doubt you'd think our SMR that advanced. Sure, sometimes the labels are attached to the correct aircraft, but sometimes you get them flying about all over the place, attaching themselves to vehicles, terminals, all sorts of things. And that's not counting the poor performance of the primary radar in thick fog or heavy rain (d'oh! Just when you need it to work!). Not to mention the constant stream of cars that seem to be crossing 09L/27R, but which are in fact in the access tunnel!