** Shares of British baker and fast-food chain Greggs GRG.L down 3.6% 1515 pence; top loser on FTSE midcaps .FTMC index
** Co's like-for-like sales growth slowed to 1.6% in the first nine weeks of the year from 2.9% in the Christmas quarter
** Co reports FY underlying profit before tax of 171.9 million pounds ($229.42 million) vs 189.8 million pounds a year earlier
** Says full-year expections remain unchanged
** GRG down ~6.5% this year, as of last close
($1 = 0.7493 pounds)
(Reporting by Megha Kumari)
((Megha.Kumari@thomsonreuters.com;))