Hi ForF, my recollections of London are a bit hazy (late 1990s, spent in a haze of Chardonnay) but I used to enjoy running round the Square Mile in my lunch break (all that lovely architecture). Also, I ran with a club called Bow Street Runners who ran from Covent Garden and around Hyde Park, Regents Park etc - well lit, even in the dark - as well as along the Mall, Horseguards Parade etc. Fraid I never ventured out east, being a Sarf London girl, and was usually found puffing and panting around Wimbledon Common and Wandsworth Common (both really good places to run). Hope this helps!