I've worked on the City for years but left 10 yrs ago and now back regularly for work. Next time it's 2 weeks late Oct. Taking my running gear as I'd got mad otherwise. Now I know the City pretty well - but am a bit stumped for a 30min running route without bashing into people. Was thinking down Cannon St to Millenium Bridge, South Bank, Tower Bridge and back up to Bishopsgate. Will that be horrible or ok?! Any suggestions? It will be around 5pm, so daylight will be pretty much going?