Found in Essex, not far from London - inside the M25 London Orbital motorway anyway, that's what I tend to count as "London" though it's not all built up at all, there's some beautiful wild areas still, like Epping Forest where I found this TB. Here's a link to a site with some more information about Epping Forest http://www.cityoflondon.gov.uk/Corporation/living_environment/open_spaces/epping_forest.htm
Will move TV TB along soon.