Revivalism – is that a dirty word? It is if you’re in a band, trying to forge your own sound while folk are sitting there spouting comparisons. As Ought have shown us Stateside, if you’re going to retread well-worn ground, you better lace up your assault boots and do so with conviction, stamping any glib reference points from the mind of the listener. Savages aren’t short on conviction. Nor are they short of muscle in the art of ratcheting up the tension within a track. Post punk was all about tension, though, wasn’t it? The London quartet’s debut, Silence Yourself,…