To mildly derail the thread, this has made me realise driving oop north tomorrow, and using the A419 might be a problem.
Anyone know what it'll be like getting to the M5 via the A419?
I have used the A419 a few times when the airshow has been on. They cone off one lane of the dual carriageway for through traffic, so things generally keep moving. It's usually the cars in the airshow lane that move slowly.
You shouldn't have any major delays and some of the back roads may be closed, so I wouldn't risk a detour.