Excellent little shop in the centre of London just by Tottenham Court Road tube station. They sell a selection of snacks, dry, frozen and fresh ingredients, prepared food ready to cook, cooked food ready to eat and both alcoholic and non-alcoholic drinks. Some Japanese products like plum wine and green tea are also available. Prices are what you would expect. You can also buy/rent Korean dramas, music and films though I’ve never tried this so I’m not sure how this works or how much it costs.