Right so I made it here, M1 was poor visibility and heavy rain from Northampton / junction 15 all the way to present location, where its still raining heavily.
Not much in the way of flood water here, luckily, at least the route I took, but, did hit one "puddle" at the side of the road which my vehicle turned into a wall of water as high as the vehicle itself. 4WD saved the day though.
Wouldn't want to be out in it at this time though, think the traffic volume helped stop it settling.
Thoughts to everyone else braving / caught in this, stay safe.
Personally never seen anything like this before at this time of year, such weird weather, strange clouds and lighting. Maybe its just me though.