For some reason, loss of licence for ATCOs has always been difficult to obtain and those policies which have been available have never paid out what a pilot might get. To give you some idea:
When I worked at a non-State aerodrome many years ago I had Loss of Licence through GATCO which would have paid me about one year's salary (£1,500 in those days) if I'd lost my licence. A colleague of mine at the same place lost his licence due to a heart attack and the company Loss of Licence paid him 3 times his salary. A few years later an airline pilot acquaintance lost his licence due heart attck and his LoL paid him over £100,000!
The NATS "scheme" - if it still works - was something of a black art. When I was at work there seemed to be little information available but I do know of a couple of ATCOs who went out on medical grounds and they continue to receive virtually their full salaries many years later.