** Shares of British discount retailer B&M BMEB.L fall 3.7% to 166.7 pence; top loser on FTSE mid cap index .FTMC
** Co cuts adjusted core profit forecast to between 440 million pounds and 475 million pounds ($591.10 million-$638.12 million) for fiscal 2026, below previously expected 470 million to 520 million pounds
** BMEB's group revenue rose 2.9% to 1.74 billion pounds in 13 weeks to December 27
** As of last close, stock up 2.6% YTD, while FTMC up 2.7%
($1 = 0.7444 pounds)
(Reporting by DhanushVignesh Babu in Bengaluru)
((DhanushVignesh.Babu@thomsonreuters.com))