tory london mayor boris johnson warned against allowing nicola sturgeon 's snp to dominate the government of the uk .
he likened it to ` asking a fox to look after the henhouse or a temperance campaigner to run a brewery ' .
ms sturgeon set out a ` programme for delivery on a uk-wide basis ' , raising the prospect of scottish nationalist mps calling the shots on policies which apply only in england , wales and northern ireland .