I cannot understand why people do it, the trollies arent toys, especial annoys me when there is a child seat, Saw a kid of about 10-12 sitting on top of the shopping recently. "Because the kids like it", they may well, like playing on a railway line. My Sainsbury used to have a sign ssaying, "no children standing or sitting in trolley", not in the seat, it also said just inside the shop, no skates,bikes,scooters, they have now given up. if you want to loook it up, Dr Charles Gerba of The University of Houston, tested shoes, 27% had e coli, 39% c diff. After just 2 weeks from new 440 units of bacteria on the soles, compared with 1,000 on a toilet seat.You walk in dog,cat,bird,fox,mice,badger, tpee and poo, you cant see it. I have seen kids with leaking nappies plonked in trollies, under 2 years old, normal gut flora contains c.diff.I have never seen any evidence of bird poo, in my local supermarket, but the trollies are under cover, I hardly think foxes, etc. are going to be climbing into the trollies. Dont see how kids can enjoy arranging the shopping when they are sitting amongst it. I suppose the poor little darlings just havent got the energy to walk round the shops.