Having been in the engineering business for some years I know well that many plastics are not UV resistant and thus break down over time. Some of the plastic we recycle into the bins in not recycleable and therefore is simply placed in with normal land fill. The answer here is to help it break down in sunlight before it goes into the ground. Take all your none recycle plastic and lay it over your front or back lawn for 6 months to allow natural UV light to help dissolve it. This is a real eye sore I know but really works.

Loo paper is toxic! It's full of bugs like E. coli that come out of your gut. In your intestines they digest your food, but if you eat those plants (or if a kid ate the paper or played with it then put their hands in their mouths) those bugs will make you sick. Loo paper should go in the middle of a compost heap (where it's hottest and the bugs will get killed by the heat). Alternatively, use reusable cloth wipes (make your own or buy them on the internet), or, best yet, get a plastic squirty bottle, keep it by the toilet and use it to wash the mess straight into the toilet.