Yes, I think TW are the long time developer owners of the old reservoir site.
I seem to remember that the site was originally given protection from development because it supported a selection of plants not usually found in Lewisham. The lime from the reservoir having changed the make up of the soil from acid to alkaline.
There used to be a page on the Lewisham website giving details but, rather ominously in the light of the following link, this seems to have disappeared.
http://www.lewisham.gov.uk/myservices/pl...%20Ltd.pdf
I can't see the reservoir listed in the final site allocations document so I am guessing that TW were successful. If so we should expect to be the site to be unsympathetically over developed in the usual Lewisham manner. You do begin to wonder if there is any hope left for Forest Hill's green spaces.
Meanwhile, another testament to the qualities of our local Planning Department, Tyson Road, lies trashed and undeveloped four years after planning permission was granted. No green space, no houses, no community.