** Infrastructure Consultancy Opus International Consultants Ltd rises as much as 6.8 pct to NZ$1.880, highest since June 6, 2014 ** Company recommends to shareholders to accept the increased offer from Canada-listed professional services company WSP Global Inc for all shares in OIC ** Opus says WSP has agreed to increase the total amount paid to accepting shareholders to NZ$1.92 per OIC share, including a fully imputed cash dividend of NZ$0.14 per OIC share ** Says WSP's offer, which is firm and final, now values the entire issued share capital of OIC at approximately NZ$283.9 million ** Stock posts biggest intraday pct gain since Aug 14 ** As of Tuesday's close, stock had risen about 97.8 pct this year ** Among the top performers on S&P NZX All Capital Index (aditya.srivastsav.thomsonreuters.com@reuters.net)