Funny how after a few years of looking at models in winter and summer one's eye gets drawn more and more to that little corner of the North-West Atlantic over and just south of Greenland. With a few exceptions, low pressure over Greenland is better news, high pressure there is bad news. Those few exceptions being when either a. the Greenland low extends South East and brings us North-Westerlies, or b. the GH curves round East then South and we get the Southern edge of an extended block, as happened through much of July 2006 and parts of summer 1995.
I prefer hot spells with a zonal component because I live in the South East. I think things are different if you're further North. For me the perfect pattern would be low pressure over Greenland extending into the GIS, and then linking with a low over Svalbard.
As for hot temperatures, I think if this plume had been delayed by about 12-18 hours we could have seen 35-36C tomorrow, as it is we'll get a 30 somewhere, and a very warm night.
Brockley, South East London 30m asl