By Laura McGuire Employee-owned John Lewis has faced a series of dilemmas over the past few years, but analysts are “cautiously optimistic” that a refresh of its top table will help aid its balance sheet ahead of its results next week. In January, the struggling high street store bought former director Peter Ruis back to lead the group’s department store business. The high street heavyweight has had senior-level stints at some of the world’s most recognised fashion brands, including Jigsaw, Anthropologie, Marks and Spencer. Just under a year ago the Partnership, which owns Waitrose and the cha…