In the winter of 2008, we discussed how GiGL had been commissioned by the Capital Woodlands Project to help identify areas of London lacking street trees. In this article, we return to the subject but take a broader look at street trees in London and at aspects of street tree data management. The London Assembly’s 2007 report, Chainsaw Massacre, highlighted ‘the unfortunate practice of removing broadleaf trees to avoid subsidence damage claims’. At the same time, they found that ‘Londoners value the shade and cooling that urban street trees offer in the summer, how they improve street environments and reduce noise and dust from road traffic [and] crucially, how they also mop up carbon emissions’.