My understanding at the time was that Norwich Radar was done from a console at Coltishall only while Coltishall was operational. In the evenings and weekends, Norwich Radar was done from a position in the Norwich VCR using a display that doubled as Norwich Tower's ATM whenever Radar wasn't there.
The reasons for using a console at Coltishall were presumably to do with ease of coordination, given the close proximity of the two airfields and their approach/climbout tracks.
I don't know what the operation at Norwich is like now, but I'd hope they at least have a separate Radar Control Room.