This is not true. Almost all woodland in England had been managed until WW1. When I was younger, we lived next to a remnant of Rockingham Forest. About half of what I played in was coppiced hazel, and the rest mixed hardwoods. One part stands out in my memory, a stand of maybe eight ash trees planted close together, which were straight and seemed much higher than the rest of the canopy. I learned later that they had likely been planted like that for long straight timber such as fence rails.