If you ever had access to the database showing all MOD owned land and properties you’d see the MOD is a huge land owner and in surprising places (e.g. barns on a small square of land in the middle of nowhere).
Also, I used to live adjacent to Ash Ranges (just to the east of Aldershot) - miles upon miles of poor quality soil, heathland, marshy ground, low quality woodland. When the ranges weren’t in use, they were open to the public.
The wildlife I found (apart from the everyday garden creatures) included lizards, slowworms, adders, grass snakes, toads, squaddies, kingfishers, woodpeckers (two different types), squirrels, deer, and various odd beetles, moths and BFO ants.
I’d say MOD lands are bastions for obscure wildlife.