“Are we having a nice time so far? Are we getting a bit warmer?” Amy Macdonald grins, peering out at a Hammersmith Apollo audience bundled into coats and scarves. It’s a question that becomes a running joke throughout the night — because despite the November chill and the decidedly frugal heating, Macdonald sets about warming the 5,000-capacity venue the only way she knows how: with humour, heart, and a powerhouse performance that leaves no seat unshaken.