The temperature map from NOAA shows a cool patch in the North Atlantic where the Gulf stream travels towards the UK..
Professor Stefan Rahmstorf of the Potsdam Institute for Climate Impact Research in Germany says that the speed of the Gulf Stream has slowed by 15-20% and this is likely caused by the big increase in melt water coming from Greenland. This melt water has increased substantially recently and has reached 13,000 cubic kilometres between 1970 and 2000 and has likely increased since then.
Fresh water floats over the salty sea water and has the ability to stop the normal sinking of salt laden sea water when the Gulf Stream reaches the Arctic region off Norway.
Sudden changes in climate can have unforeseen outcomes which must be a worry for the UK