BUZZ-John Menzies: shares hit by weak outlook
** Support services firm's shares down 5.6 pct, poised for biggest one-day drop since early Nov in relatively strong volume
** Says increased start-up costs & operational difficulties at Heathrow to impact H1 2015 results; posts 39 pct drop in FY pretax profit
** Co, whose interests are split between aviation services business & print distribution business, says 2015 results will be weighted towards H2
** Shares (Berlin: DI6.BE - news) in co had fallen to more than 4-yr low of 385 pence in Nov when it warned FY aviation unit profit would be below expectations (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)