UK prime minister David Cameron should have allowed the 'devolution max' voting option in the forthcoming Scottish independence vote, in what will be a "really close" vote, according to one of the leading figures in the Scottish financial industry.

Aberdeen Asset Management chief executive Martin Gilbert said the proposal to allow Scottish voters a third way, other than "independent" or "together", would have given Scottish Parliament responsibility for laws and taxes except currency, defence, foreign affairs, financial regulation and monetary policy.