Slight thread drift.....
I remember working in PATCRU in the early '70s when a RN Devon, 25nm NW Wal on the old R3 called "Mayday, Mayday, double engine failure", and the Procedural ATCO [at PATCC] replied with...."Roger Navy123, maintain F80"........
Preston Air Traffic Control Radar Unit was on the first floor of the Tower Block at Manchester Airport......
Preston Air Traffic Control Centre was at Barton Hall, near Preston....
Oh how things have changed.....
watp,iktch