By City AM reporter The Government’s controversial new law to provide minimum levels of service during strikes will be attacked on Saturday at a special conference attended by leaders of the country’s biggest trade unions. The TUC has called its first special national conference in more than 40 years as it steps up opposition to new regulations announced by ministers following 18 months of strikes by hundreds of thousands of workers over pay and conditions. Metro mayors and council leaders from across the UK have warned that the new law will make disputes harder to solve and lead to more frequ…