Have a look at this lovely project from the Royal Botanic Garden in Edinburgh. Have you got a forest to add? Or are you near enough one of the those already listed to go and visit it? Forgotten Forests
All the forests that grow to my mind are either lost and long ago fell to the axe or I don't know if they still thrive...need to do some checking!
Here is Dollar Glen - where the Burn of Sorrow and the Burn of Care run down from Castle Campbell (or Castle Gloom, just to keep to the dolourous feel going...). Dollar, Clackmannanshire