Forty Years Ago: QPR Advance Towards Wembley Winning League Cup Semi-Final First Leg

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Forty Years Ago Today,in the League Cup Semi-Final, first leg: One of QPR's greatest/most significant all-time away victories (in the top ten, albeit arguably not "THE" greatest/most significant)
At St. Andrews, Birmingham 1 QPR 4. Scoring for QPR: Marsh, ROger Morgan, Mark Lazarus and Les Allen.
QPR's team against Birmingham:
Springett
Watson, Hunt, Sibley. Langley
Sanderson, Keen
R. Morgan Allen Marsh Lazarus
(In the second, home leg, played almost a mnth later, QPR won 3-1 (Marsh 2 and Mike Keen) and QPR were at Wembley.