Here's something that some US citizens might not realise about the UK.
When we buy something in a shop, the item will have a price on the shelf, and that is the price you pay.
You don't take it to the checkout or cashier and then find that they have added on a tax of some sort.
Equally, if the pack is marked at a lower price than that displayed on the shelf edge, they are legally required to sell that item to you at the price marked on the pack.
If you use a self-service barcode scanner type of thing, carefully check your receipt as sometimes 'in store offers' like a BOGOF or 2-4-1 type thing might not be programmed into their system so if you were expecting to only pay half the full price because of a displayed offer, and it gets charged at full price, again the store is legally required to refund you to the correct amount.
When we buy something in a shop, the item will have a price on the shelf, and that is the price you pay.
You don't take it to the checkout or cashier and then find that they have added on a tax of some sort.
Equally, if the pack is marked at a lower price than that displayed on the shelf edge, they are legally required to sell that item to you at the price marked on the pack.
If you use a self-service barcode scanner type of thing, carefully check your receipt as sometimes 'in store offers' like a BOGOF or 2-4-1 type thing might not be programmed into their system so if you were expecting to only pay half the full price because of a displayed offer, and it gets charged at full price, again the store is legally required to refund you to the correct amount.