If you need to contact the City of London / Epping Forest Parks authority concerning any incidents on Wanstead Flats, the telephone number is
020 8532 1010
Links
Wanstead Flats is administered by the Corporation of London.
Currently they refer to it as Wanstead Playing fields. Their home page for it is here.
It is interesting to compare it to their page on Wanstead Park which is here
Wanstead Wildlife is an informative independent website dedicated to the Wildlife in the local parks including Wanstead Flats.
Friends of Epping Forest is another residents group who campaign to protect Epping Forest as a whole.