SIR David Jones is to stand down as chairman of JJB Sports at the end of this month due to "continuing issues with his health", the company said.The former Next boss, who has spent the last year fighting to save the Wigan-based retailer from collapse, has had Parkinson's Disease for the last 28 years. Yorkshire-based Sir David will remain on the board as a non-executive director and help new chief executive Keith Jones settle in to his role.He joined the company as a non-executive director in 2007 before becoming executive chairman......for the full story register now for free or login below...