[Updates Saturday, 9th, PM: One lane is now open on the Northbound so not full closure but may change for tomorrow so please check.]
You may be already aware of this but in case you are heading Silverstone tomorrow using the back route…
A5 Northbound is closed until Monday for roadworks in/around Milton Keynes.
There are several roadworks around Whiltlebury but not a huge event like F1 GP so either go through the village or A413 can be used addition to the A43 bypass.
Kaz