LFM (London Flickr Meetups) is doing its 8th Annual London All Nighter.

This is a free event (and you don't have to attend for the whole night) and starts around 8pm (sunset) with a walk through various parts of London until the finish at sunrise. There are plenty of opportunities to grab a whole host of different images from cityscape to lowlight and maybe even the drunken teen throwing up  😀

Full details are here https://www.flickr.com/groups/londonflickrmeetups/discuss/72157652623659939/ and the route is here http://www.mapfab.com/map/OuA/LFM-overnight-walk-2015

Give me a shout if you want further details.