It's UFO Day: un-flushable objects and unlikely aliens

This week, Claire explains why certain things, like fats and oils, leftover paint, flushable wipes and bamboo nappy liners, and cat poo, should not go down the drain or sewer, even if it's very tempting; and Stu commemorates World UFO Day by telling us how despite people still reporting unidentified phenomena, the idea of aliens visiting Earth is still very improbable.