If you were on your way home last night thinking 'looks a little foggy around here' that may have been the resulty of the huge scrapyard fire which happened in Slade Green in Erith, east London yesterday.
The fire was so big that it took ten engines and fifty firefighters to tackle it.
The Sun has some good pictures of the smoke wafting across Canary Wharf (and they also have Deidre's video casebook which is hilarious).