UK's Severfield up on 10 mln stg share buyback, upbeat forecast

* UK-based structural steel company Severfield's SFR shares rise 10% to 60.4 pence; among top pct gainers on FTSE Small Cap index (.FTSC)

** Company announces 10 mln pounds ($12.5 mln)share buyback programme

** Company forecasts FY result which is slightly above previous expectations

** Names Charlie Cornish as non-executive chair and director, Kevin Whiteman to step down from board

** As of last close, stock down 6.2% in past 12 months

($1 = 0.8031 pounds)