NEW boss Bob Mackenzie vowed to capitalise on the strength of the AA's brand as the roadside assistance business released its first set of results yesterday since its £1.4 billion June flotation. The motoring organisation, with around four million members, saw sales lift 1.6 per cent to £491.7 million in the six months to July as it won new contracts from VW, Hyundai and Porsche. But its pre-tax profit plummeted almost 92 per cent to £10.2 million, after incurring £178 million of flotation and financing costs run up by the previous owners.