The managed bits of a Forestry area do not contain anything particularly rare and the trees are regularly cut down to sell to other Northern Europeans (!) or to make telephone poles with. it is the bits with the “funny looking trees” where the rare stuff is. Whenever I’ve seen them they are often marked out with signs like “Forestry Operations/Defra/Keep Clear” and sometimes even fenced off. In some cases there is a plinth near them that contains a sign explaining what can be found there. Unfortunately, people sometimes use these as toilets (because they are out of the way from the rest of the party and it is often too dark to see the signs) which understandably annoys the environmentalists).