Yes, that's the BRECONSHIRE. (p.398, British And Dominion Warships Of World War II, 1964, (USA1968) Best place to look is history books on Malta war, etc. and books on British merchant ships.
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Info. on pg. 398. Pennant number Y1.3 9776/39 1939 Fleet Supply Ship Lost 27/3/42. No armament listed, but sister ships the three Glens.