Ha mate dom is right. It's the self service checkouts. They drive me insane. Doms correct in saying if you have a bag that the weigh thing don't recognize it plunges the shop into chaos.
And sometimes trying to get the dam scanner to pick up the bar code is just tooooo much.
And how many of those bloody hessian bags have I know got in my shed. I just keep forgetting to take them. Next time we need a carpet I'm going to use all the tesco hessian bags that I have got.