I've just received this email back from Skanska - looks like it's TFL who are trying to save a few pounds!

Any other issues let me know @paulupex if you are on twitter or email cll_paul.upex@lewisham.gov.uk

"Our operatives have been working in Forest Hill today as we also received complaints about some of the column decorations not working. Most of these turned out to be in London Rd , these are TFL columns and it turned out their contractor has been disconnecting the lights. We have spoken to TFL so hopefully now this will stop. I have also asked out team to check out the tree, so everything should be on this evening."