BUZZ-New Zealand's Gentrack Group rises on UK contract; reaffirms FY outlook
** Software (Xetra: 330400 - news) company Gentrack Group Ltd rises as much as 7.1 pct to a level last seen on June 23
** Says signed a new contract with a UK-based water utility company
** Gentrack also reaffirms FY15 guidance
** Says continue to make progress towards signing another contract with an Australian energy firm
** Stock among top percentage gainers on NZX
** Shares (Frankfurt: DI6.F - news) on track for a record single-day percentage gain (Reuters Messaging: anusha.r.thomsonreuters.com@reuters.net)