Mode C readout
It seems the problem with the radar is actually the Mode C readout. There are some anomalies in some of the north sea area where the Mode C is shown incorrectly. This problem, they say, will be sorted in a couple of years when Mode S is introduced, but until then, 5 miles separation needs to be used, regardless of the vertical profile.
I agree that maybe this should have been spotted before Swanwick opened.
The question I want to ask is this. If there is no fix, then does that mean this problem existed at West Drayton before we moved to Swanwick? If so, why the hell wasn't it detected sooner!