Plaid Cymru has launched a review of Thatcher’s “damaging” industrial laws in a bid to double Welsh union membership, leader Leanne Wood announced yesterday.

Ms Wood made the pledge at a meeting of the left-wing Compass campaign group at the Unite headquarters in Cardiff.

She said the the trade union movement must be “re-energised” to fight right-wing advances in the wake of Ukip’s latest by-election success last week.