I was just about to ask the question - " where are the Carp , still in shallowish water , or have they started to slide off to the deeper water , because I can't seem to find them , or if they are where I have cast they are not blinking biting ? " , when I saw this thread .
I can't remember who suggested it ( Newmarket ? ) , but 2 out of 3 of my last sessions were with a Northerly breeze , so when what wind there was swung around to the South I thought " this is it " - it wasn't .
Usually after a hot , windless August , September brings big South Westerlys that oxgenate the water and shake things up , but apart from Newmarket in " Chicago " ( that'll teach him to live in Essex ! ) I don't remember any big winds .
I guess that although it's unseasonably hot , the fish know it's Autumn because of the reduced daylight hours , and so are starting to slow down / stopped dead ! .
It's very helpful to learn that I am not alone in my struggles to get a bite , at least it has stopped me fiddling unecessarily with my rig and / or change my bait .