BUZZ-Drax: FY core earnings beat
** British power producer Drax up 6 pct after reporting full-year core earnings above analysts' expectations
** Drax reports FY EBITDA up 64% to 229 million pounds ($319.87 million); analysts on average had estimated EBITDA of 225.4 million pounds, according to Thomson Reuters I/B/E/S
** The company says revenue grew about 25 percent to 3.69 billion pounds
** Drax says board has agreed to undertake a 50 million pound share buyback programme during 2018
** Among top gainers on FTSE 250 (RM (LSE: RM.L - news) :harish.bhaskar.thomsonreuters.com@reuters.net)