Unite assistant general secretary Steve Turner has launched a scathing attack on Tory PM David Cameron's threats to impose tougher anti-union laws, warning that unions will work "outside the law" if they are forced to.

Mr Turner told the People's Assembly Hands Off Our Unions campaign launch in London on Tuesday evening that unions would not tolerate bully tactics from the PM to curb workers' rights.

It followed Mr Cameron's call for an inquiry to consider strict new anti-union laws in the wake of the Grangemouth dispute.