Paddy and Molly: Show No Mersey is a cheerful but brutal reality doc

Mixed martial arts (MMA) is apparently one of the world’s fastest-growing sports. A melange of full-contact disciplines from all over the globe, it involves punching, kicking, grappling and ground-fighting, with seemingly very few rules. Imagine a barefoot street brawl and you’re almost there. I had to look all this up, because the new BBC Three docuseries Paddy and Molly: Show No Mersey assumed prior knowledge. With tennis or football, you might get away with that, but not with a sport …