Clear night ? - maybe but foggy morning!

I Blipped the moon last night because the sky was clear and I said they forecast no frost. Wrong -  woke to frost and fog ! 
Paths very slippery, birds water frozen - but at 7.30am I could hear the rowers training on the river - they must get up before 5 as they are the rowers from Cambridge University - they have a boathouse in Ely and train between Ely and here.
As the sun tried to break through I got an atmospheric shot - and an extra pic too.