"Hardly Lewisham's fault if (as an earlier post correctly suggested) it isn't in their remit..."

I would be surprised if it were not within a local authority's remit as it probably required some form of planning consent (with conditions) when it was first erected.

I now have the contact details of the person who administers the lovelewisham site and who is responsible for allocating any action. See what they have to say on Monday.