And some of the multitude of Turkish barbers, mobile phone accessory shops, hand car washes, vape shops, ethnic speciality food shops, american candy shops, dodgy fast food/kebab shops, etc.
Even "normal" looking sandwich/pie shops and convenience stores are sometimes used for money laundering - certainly the ones that never seem to have any customers, yet a shop full of stock, that seemingly no one ever buys.
It's all about "shops" with low costs of sale, i.e. labour only places like nail bars, massage parlours, turkish barbers, or those like mobile phone accessory shops where they can fill a shop with stock for a few thousand pounds by buying a container load of cheap Chinese crap. Same with sandwich/pie shops - very low cost of stock, i.e. a counter full of cheap stuff from aldi for £100. Same with convenience stores - fill it with cheap unbranded soft drinks, crisps, etc., and you have a "full looking" shop at not too much money!
It's just common sense. When most "genuine" shops are closing down on a daily basis, isn't it a bit strange that others which never seem to have any customers seem to survive, and not only that, but seem over-staffed, and usually a brand new Merc or BWM parked on the pavement right outside??
Labour intensive places like hand car washes, nail bars, massage parlours, fast food kebab and pizza shops, etc., can also be modern slavery, sometimes with the workers living in squalor above the shop in bunks or in sleeping bags on the floor.