RHS - I contacted Lewisham who put me through to Skanska. The person tasked with fending off enquires is marc.zahra@skanska.co.uk However there replies are badly written and intone 'energy efficiency' and 'British Standards'. I suspect that a better purchase may be achieved through contacting your ward councillor. I contacted Cllr Alex Feakes, who responded at least. ...and the new bulbs are 60w.