You get the impression Alex Kapranos enjoys this kind of thing. The frontman strutted on stage, fully decked out in signature skinny suit and tie, looking like he was born there. Sporting a newly bleached quiff and rockstar pout, the Scot had a heavy whiff of Bill Nighy’s character in Love Actually about him. There were hips thrusts; there were finger wags; there were even Eddie Van Halen style guitar jumps. And like the aforementioned Nighy, you can’t help but be endeared by his performance. Before the Dublin crowd got this show of old school entertainment, there were some young…