A council has unveiled a huge £434 million spending programme for the next 10 years, which includes forking out £60 million for a new leisure centre. But members have warned the authority will need to keep a close eye on borrowing. Nearly £350m would have to be borrowed to fund the “pretty massive” ambitions, which would see £15m go purely on interest payments in the first five years. The plans were discussed by Maidstone council’s cabinet at their last meeting. The authority wants to spend £155.7m on its commitment to build 1,000 affordable homes, £20m on its own temporary accommodation for t…