Hi there Fox Slayer,
The ANCDM is a recognised qualification that was the result of a years course at Sparsholt College, Hampshire. I attended the first one in 1988-89, and I believe that it was run for about four consecutive years after that. However, it has now become incorporated in the National Diploma in Game & Wildlife Managememnt.
The ANCDM course was a superb course dealing with all aspects of wild, park & farmed deer management. My lecturer at the time was James Cordery (Now Deer Initiative), but I believe that as part of the NDGWM it covers only wild deer management - perhaps a small element of park deer.
It was never anything connected with DSCL2, and was far in advance of any other deer management courses being run at that time, or since - in my opinion.
Hope that helps mate.
Merry Christmas.
Mike.