LONDON - Christmas jumpers, once only thought stylish by knitting-needle wielding grannies, are enjoying a renaissance in Britain after being adopted as a festive fashion statement by young revellers. Responding to soaring demand for the colourful and eccentric creations, vintage clothing group Beyond Retro has opened a temporary store selling only Christmas jumpers in London’s trendy Old Street. “It isn’t just hipsters that are doing it now, it’s everybody, office workers to mums, dads, kids buying them for their whole family, everyone is getting involved and that’s what so exciting,” said Ashley Emerson, head of development at Beyond Retro. One happy customer was Louisa Tomlenson, a 33-year-old housewife.  “We’re all going to wear it (on Christmas Day), my husband, the children and everyone,” she said.  “It’s everywhere, in lots of shops,” she added.