By Sue Crawford It just wouldn’t be Christmas for millions of us without a singalong to Slade’s biggest hit. But there’s little festive season goodwill left among the band’s original members these days. Fifty years after Merry Xmas Everybody first topped the charts, guitarist Dave Hill reveals there’s no “look to the future now” for the original Slade. He says he doesn’t speak to most of his former bandmates and there’s little chance of the charts-storming glam-rock quartet ever getting back together. As he starts a tour to mark the famous song’s anniversary, Dave, 77, says: “That won’t happen…