Sock Shop, the iconic 1980s specialist store, is to open its first retail outlet in the UK since the chain closed down after going into administration three-and-a-half years ago.Ruia Group, the hosiery and textiles manufacturer who bought the Sock Shop brand from the administrators, are opening a store at Manchester Airport this week.Amit Ruia, head of retail, said the airport store was intended to be the first of at least 10 outlets at airports in the UK over the next five years and more than 20 longer term