I have studied Roe deer for many years now and know the long standing argument between Petworth and Milton Abbas as to where the re-introduction of Roe took place in England. I am fortunate enough to live very close to Milton Abbas and have even stalked the ground where the deer were (IMO) originally released. Unfortunately I was born in Reading, Berkshire a distance of only 90 miles and still hold stalking ground there, so regularly make trips.
I remember as a schoolboy walking through a local wood in Reading in 1983. That was my first ever encounter with a Roe deer. It was only a stalker some twenty years later that whilst talking to an elderly resident, who had lived in the same area all of her life that she recalled that in her words " there were no deer in this area until about 1984"
The reason that I personally believe that Milton Abbas, Dorset was the original release site is that Petworth Park, Sussex is only 50 miles away compared to Milton Abbas at 95 miles. Also seeing the rate at which Roe have now expanded, it begs the question as to why colonisation of Kent (which is borders Sussex) has taken so long??