Noooo Nobby you need to get behind the woman that is 3 quarters through her check out items and decides she has forgotten something, and just buggers of for 5 minutes to get what she wants, then fumbles trying to open the plastic bags and packs her stuff very slowly then pays in cash and has to grovel through her purse for every last centimo, still not having packed everything when the next persons stuff starts to come down the checkout, Grrrrrrrrrrrrrrrr