By Shashwat Chauhan (Reuters) -British equities edged lower on Friday as a dour GDP reading brought forward recessionary jitters, while investors braced for the latest U.S. inflation data due later in the day. The blue-chip FTSE 100 slipped 0.1% as of 0901 GMT, and FTSE 250 midcap index fell 0.3%. However, the indexes are set to extend gains to a fourth and third week, respectively, as global markets rallied on the Federal Reserve’s dovish pivot while a surprise drop in domestic inflation boosted UK equities. Britain’s economy might now be in a recession according to data which showed output s…