<<all the ATCOs already in place at (London) Oxford are to be trained and validated on Radar>>
It's a bit more complex - they have to undergo an approved course of training and pass the appropriate exams for a radar rating. Then they have to validat the rating locally. It's not a 5-minute job and if they don't have the aptitude for radar.........
I'd go back for £100k plus all the coffee I could drink!!