Part of the draw of the Height is the managed nature, but the self sown sycamore does damage to the heritage and also the chalk grassland. Left to go wild won't help this. Rare orchids will go, grazing won't take place if there isn't more funding.
Already huge amounts of damage has been done by ivy, buddlea and tree to the moat walls. If left, I suspect that before long the walls around the Drop Redoubt will be in danger of collapse and eventually will cause areas to be sealed off. I have seen it tear away brickwork and in areas there are many courses of brickwork dropped away. Already areas are in a dangerous condition and you cannot allow public to walk in and around areas without serious investment and a long term strategy
Here is a small amount of damage from ivy and buddleia, some of this below Knights Templar !!!