Wollaton Park is surrounded by 7 miles of wall. Most (all?) of it is a Grade 2 listed structure.
Over time weeds and seedlings grow in the wall, damaging the face of the bricks and the mortar holding it together.
The Saturday Conservation Volunteer group carefully cleared the growth from outside of the front wall between the car entrance and the car exit.
With 7 miles inside and out, there is plenty more to do. Perhaps you could help next time – future dates are published on the volunteer page.