lucky you, ladybirder. I imagine they fill out the orders at the nearest depot, so ours would come from somewhere in NW London; but lorry
In fact I've sometimes gone to an actual shop the day after receiving an order and found the things they didn't have the day before. Supermarkets operate a just-in-time delivery policy so that in theory shelves are never too full or never too empty; but it doesn't take many driver shortages to disrupt the strategy.