Mayor of Greater Manchester, Andy Burnham Andy Burnham, Mayor of Greater Manchester, has endorsed the 70/30 campaign. Wave has engaged with the Greater Manchester Local Authority, feeding into their work to become one of the foremost UK local authorities in implementing early intervention. Mr Burnham says '‘I have long been a supporter of the argument for putting prevention first. WAVE Trust are leaders in promoting prevention. Their 70/30 strategy has my full backing'