aLEX SaLMOND'S claims that English subsidies would continue to fund Scotland's green energy industry after independence are "highly unlikely", a bank told its clients last night in a fresh warning about investing here before a referendum.  Peter atherton, Citigroup's head of utilities research, said England and Wales imports just 3.3 per cent of its electricity from north of the Border, most of which comes from Scotland's two ageing nuclear stations and could "easily be replaced".  It is "hard to imagine" England and Wales buying power generated by offshore wind in Scotland when this would probably be the most expensive option and they could develop it more cheaply themselves, he said.  He also rejected Mr Salmond's claims that large companies investing north of the Border provided evidence that the referendum was not causing