The streets around here are littered with these empty nitrous oxide (laughing gas ) cannisters, I've found two thrown in my front garden this week alone.
When I was at my sisters over the weekend the road at the front of her house was littered with the things also.
This picture in the local rag was taken outside a school
apparently you can buy these on Amazon for 30p each but they're not supposed to be sold to the general public.
