Blimey! If you thought giving Guy Ritchie a go at Camelot mythology was a silly idea, you’re in company: every inch of the film seems to agree with you. After some opening titles that look like they’ve been designed on Windows 95, King Arthur: Legend of the Sword (even the subtitle is naff) opens in a fantasy version of Ye Olde Past. It’s basically Game of Thrones without the realpolitik: squires and mages and giant, CGI elephants controlled by a guy in a hood named Mordred. To be fair to Ritchie, he doesn’t mince around, attacking the Arthurian mythos with…