The difference between mist and fog, apparently, is down to distance. The thick white stuff is fog if one cannot see further than 1km. In which case we have definitely had a foggy week.
The majority of these images were captured in the last couple of days, during which time London has been shrouded in mystery. It has made the capital look like we imagine it did in Victorian times, with hansom cabs drawing up beneath dulled street lights...
All images, as ever, from the Londonist Flickr pool: Chris Dorley-Brown, Rudolph van Graan, Ravi, Andrew Salveson, Robin Baumgarten, Ian Wylie, Paul, Ian Wylie, Peter, Paul Taylor, Marc Fairhurst and Luke Robinson.