Hi Brian,
Despite a google or two, I haven't found any contact details, only some information about the site, the Croydon Canal, the woods and Nature Reserve etc. apart from what is on Lewisham Council's own website
http://www.lewisham.gov.uk/LeisureAndCul...acresWood/
I guess you will have to contact Greenscene, who seem to be the ones who run it, to find out more?
It's a pity that it was not open to the public this weekend, as the good weather will have brought many people outside
(although, maybe it might have been open today? I seem to recall that Sunday is a popular day for places such as this to be open)
Thanks for mentioning it, actually, as it has made me think that I would indeed like to visit this place myself, soon, as I have not done so yet
Sue