BUZZ-Hornby: shares surge after CEO leaves
** Toymaker Hornby Plc surges 13 after says Richard Ames is stepping down as chief executive
** Says current chairman Roger Canham will take over as executive chairman and lead group for foreseeable future
** Co said last week it expects to report a substantially wider trading loss than previously forecast
** Stock among top 2 performers on London Stock Exchange
** Shares (Berlin: DI6.BE - news) down c. 70 pct YTD
** More than 50 pct of stock's daily avg vol through in first 15 mins of trading (Reuters Messaging: rahul.b.thomsonreuters.com@reuters.net)