Why doesn't NATS use the kind of basic TWR-simulator they have at Entry Point North (Sweden)? I think it is made by BAe-systems... 270 degree twr. view stretched over 4x 27" monitors. Supported by ADA, APP + 2x pilot positions.
They do basic twr.-sim there (approx 5 weeks), while the 4 month ADI-course is done on 270 degree floor-to-roof monitors (back-projection).
TH