I saw a banner in the car park at my local Asda today stating that if you bring in any 5 old carrier bags, they'll give you a free bag for life.

There was nothing inside the store about this, and I'm not sure where you have to go to collect your bag for life - but you could soon have quite a collection of bags for life if you swap your old bags everytime you shop!

All of the details are here
http://www.asda-bagforlife.com/bag_amnesty.htm

Check for discount codes to use at www.asda-bagforlife.com