I have just noticed on a cardboard sandwich wrapper that it is compostable as the cellophane-y bit 'constitutes less than 13% of the total'. Our council tell us, however, to tear out the windows from window envelopes before putting them in the compost wheelie bin. So what is the difference, and is 13% the magic proportion of non-compostable material? So if 13% of my wheelie bin consists of, say, roof tiles, is that OK?
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