Cardiff Airport 'worth £20m-£30m' ministers were told
Ministers were told Cardiff airport was worth £20m-£30m, months before the Welsh government bought it for £52m.
BBC Wales understands the estimate from accountants KPMG appears in a report to be published by the Wales Audit Office.
Despite the advice, it is understood the airport's Spanish owners Abertis were offered £41m, increased to £55m before the sale at £52m in 2013.
Bristol Airport chief executive Robert Sinclair had claimed the purchase price was well above market value.
BBC Wales understands the estimate from accountants KPMG appears in a report to be published by the Wales Audit Office.
Despite the advice, it is understood the airport's Spanish owners Abertis were offered £41m, increased to £55m before the sale at £52m in 2013.
Bristol Airport chief executive Robert Sinclair had claimed the purchase price was well above market value.