P.S.
Some shots of how it is now...
http://www.clissoldpark.com/gallery.htm
Although the terrapins were got rid of, they were an absolute nuisance - biting the legs off moor hens, if such is to be believed.
Also, the graffiti that can be behind the skater was called 'criminal damage' by a local paper and the council tried to over-paint it with emulsion;both view and act were nonsense IMO