AG it was dark on the ground by 1900. I live a couple of miles from Gillingham (in fact I am sitting on a chair that came from Gillingham Hall as I type). I was away on Thursday but my wife was driving home at about 1900. She says the fog was thick enough for her to use the fog lamps on the car - something she does not always do - and there were patches of fog that were thicker than others as she drove.