BUZZ-James Fisher: Fall in oil weighs on results
** Marine engineering services provider's shares down 4.6 pct, top FTSE midcap losers, after saying H1 revenue at its offshore oil unit fell 36 pct
** Clients for the unit have postponed "all but the most urgent maintenance and repair expenditure", co says
** Co also says H1 revenue fell 1.4 pct, pretax profit fell 14 pct
** Offshore Oil weakness prompts Investec (LSE: INVP.L - news) to cut PT to 1250p from 1450p, but keeps "buy" rating (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)