In driving rain in south-east London, the 10 men of West Ham United summoned the kind of resilience that has been so conspicuous by its absence until now. For Slaven Bilic, who has been under such intense scrutiny in recent weeks, this was the sweetest of victories. West Ham’s manager took delight in his side’s slick football in the first half, the result of his carefully-plotted tactical plan, and later in…