But the prime minister, it seems, would rather get into the nitty gritty of corporation tax after the Scottish poll, than create a precedent beforehand.
Traditional industries such as steel and chemical makers are opposed to any action because they are afraid it will create a precedent for what they see as interference with free market dynamics that will only add costs to their balance sheets.
Council planning officials said the land was zoned for "employment" and not retail and argued that giving the go-ahead would create an "undesirable precedent".
He warned that dangling large sums of state aid before GM and Opel would set a horrible precedent and produce neither good market results nor create and save jobs.