Also on tonight's programme are the former GMB leader, John Edmonds, former civil servant who dealt with employment relations Helen Leizer and Dominic Raab, the Tory backbencher who has proposed a change in the law.

BBC: Lord Tebbit urges caution on strike laws

Scottish Labour leader Johann Lamont insisted Mr Swinney was in denial over civil servant advice about the dangers of basing the plans on a "volatile and diminishing commodity like North Sea oil".

BBC: Montrose field