North of Blue One was 'Border Radar', later to become 'Pennine Radar' when the task transferred from Boulmer to EGCC.
I have lunch often with the gentleman who was the 'civil SATCO' of both units.
'Northern Radar' at Lindholme had closed by the late 1970s, but 'Midland Radar' at RAF North Luffenham was still alive in the early 1980s.