FWIW, Exeter say northern extent of the precipitation today is River Orwell at 14Z, so basically Suffolk border southwards looks to see something from late morning before it dies off around dusk. London does look the sweet spot to be honest, lets hope the UKV is on the ball this time.
My thoughts on today's event if anyone fancies a read at this ungodly hour: https://www.essexweather.com/weather-forecast/
It will be interesting to see if UKMO update the existing warning. This wouldn't be the usual 11Z update, more likely 05-06Z if confidence or impacts have increased. Yellow is sufficient still, certainly not amber territory.
Should be a good day for the region, those who have missed out from prior events