I remember the circular radar displays at Blackpool some years ago. Black background and green graphics giving a very clear sharp picture. I think there was a Plessey AR15 on the other end but I don't remember seeing any SSR data. St. Anne's was only the other side of the fence if needed. Humberside's first radar display was also a black/green number but bigger than the Blackpool stuff. Probably the same model as used at West Drayton during the CCF trial. Cossor maybe ?