It might not be much, but still £0,30 is not bad for chucking 3 cans of beer.
In Sweden Cans and Plastic bottles have ‘Pant’ and depending on their size the amount of money you get varies from a minimum of 1kr (£0.10) to a maximum of 2kr (£0.20). Still, if someone was to collect loads of rubbish they could make quite a bit of money by being ‘environmentally friendly’.