Living on the east coast of Wales, I found out the 'hard way'. A neighbour who shops for me at the local Aldi bought me whisky & pils, when I saw the prices they were £5 more on the whisky & £1 more on pils. By this time the receipt had been binned & Aldi just quoted prices were different in Wale & Scotland, but I'm in England? The following week prices were back to 'normal', & all I got on again contacting Aldi was, "retun the items to store, with receipt, for a fefund", of course by now it had been opened! Several weeks later my neighbour again shopped a bot. of whiskey for me & again it was £5 more, but this time he had gone shopping 'down the road' iin Wales. This was when it became clear to me! Looked like some geography dimwit thought my local Aldi were t'other side of border in Wales & programmed wrong prices.