Just been to Tescos, and watch in amazement whilst a woman got bags out for her two children one around 4 the other around 7 which one after the other she got them to wee in before tying a not in the bag and putting it in her trolley where other people will be using it after her. it was one of the 4 child trolleys that has an upper and lower shelf. there are toilets just outside the shop she was only in the first 3 aisles!