Southampton have secured a return to the Premier League with a well-earned 1-0 win over Leeds United in the Championship play-off final. Southampton were excellent to a man, as they were the better side with a dogged defensive display after taking a 1-0 lead through Adam Armstrong‘s clinical strike in the first half. That was Armstrong’s 24th – and most important- goal of the season after Will Smallbone threaded through a perfectly weighted ball for him to beat the Leeds offside trap and fire past Illan Meslier. Manager Russell Martin deserves enormous credit for the way he has steered Southam…