BA and Swiss ERJ145s were on a "collision course" according to this report last Tuesday morning, just south of MAN. It states:
"The near-miss happened at 11,000 feet as the two aircraft were travelling at speeds approaching 300 mph over north east Cheshire. It is understood the trainee failed to spot the imminent disaster and the planes got so close their images started to merge on the radar screen. A supervisor realised there was a major problem and tried to take action but the pilot of one of the planes had already spotted the other aircraft and manoeuvred to avoid a crash."