BUZZ-Serco: Best day in 3 mths after raising outlook
** Outsourcing co Serco's shares up 10.6 pct, top FTSE mid-cap gainer, after hiking forecast for FY revenue and trading profit
** Co sees FY trading profit of at least 65 mln stg, FY revenue of about 2.9 bln stg, vs earlier expectations of 50 mln stg profit and 2.8 bln stg revenue
** Best day for co in three months, with more than twice its 30-day avg vols gone through in the first hour of trade (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)