By Jennifer Sieg The costs of the HS2 line from London to Birmingham could be as much as £66bn, according to the scheme’s executive chair, Jon Thompson. Thompson told the transport select committee on Wednesday that despite the current estimate being upwards of £56.6bn, the first phase of the high-speed rail project could add “between £8bn to £12bn,” suggesting the current prices are outdated. Estimates have continued to rise over the past decade, with the forecast being just £19.4bn in 2013, according to reports in the Guardian. However, the outlet reported that the latest change comes becaus…