If you are not already aware, a construction project which will create one of those massive basements is being considered by Haringay Council. It is located at the Highgate end, near Holmesdale Road. While I could comment on why a small railway cottage that has already been expanded to become 5 bedrooms needs even more space(!) the real worry is that in order to construct it, HGVs will travel along a section of the walk itself at Holmesdale Road along with other impacts - the proposals are contrary to the covenant that the council put on the property back in 1993! The works provide no benefit to the local community and in fact is likely to damage the nature reserve, block access for periods of time and disturb the at sanctuary in the nearby tunnels. It also sets a bad precedent for other properties that adjoin the Walk.
Have a look and get your voice heard!