I t was supposed to be a carefully choreographed walkabout for John Swinney through his party’s target seat of Hamilton. Instead, the Scottish National party leader was confronted by angry voters, including his own. Natasha Kelly, 35, railed against the local council’s failure to improve the damp council flat that had left her 13- and eight-year-old boys with chronic asthma. Natasha Kelly talking to John Swinney on Wednesday. Photograph: Wattie Cheung A pro-independence SNP voter, she is wavering. Swinney briefly placated her with the promise of immediate action by his candidate. “I do believe in the SNP but I am losing faith vastly,” she said. “I can’t be concerned with my own country, when I concerned about my sons.” Before her Gavin Boyle, the owner of a popular Glasgow bar, was furious at his 438% hike in business rates, which has lifted the venue’s bill to £645,000. Swinney tried to placate him too. That failed. He won’t vote SNP, nor for another party. “They’re as bad as each other,” he said.…