There’s so much going on over the sum­mer at the South Bank ‑or South­bank Cen­tre,  as it’s now renamed. On this night alone there’s raw, dirty blues from The Amaz­ing Snake­heads and a come­back set from Edwyn Collins. I’m off to see Trentemøller. The last time I saw the Dan­ish elec­tro mul­ti instru­men­tal­ist was at 2am in…