Quite mad isn't it Raggytash? I'm always tempted to unwrap the items completely, and leave the plastic at the supermarket for them to deal with. I don't want flipping spuds in a plastic bag, nor onions nor any vegetables for that matter. The Americans seem to go for those paper grocery bags - much more eco-friendly.
Our shopping bags are either hessian or sturdy cloth ones I stitched myself from African cotton cloth (very jolly)

I hope you're soon feeling better Raggy.