Re 4814...Yep, just seen it go past Newton Aycliffe Tesco.
Could that be this one (shown below on map)?
Not keen on the doors on these mind (see pic below). Bit chilly!
Not surprised it is that late as the traffic lights outside Morrisons are not working and it has four way temporary lights, took the 5A 15 minutes to get from Darlington Centre to Morrisons, that's 10 minutes longer.
Is the one your on 4812, only one door would open earlier.