He said there needed to be “clarity and certainty” on how an independent Scotland would impact on business and regulation, it was reported today.
He said: “We have been in Edinburgh over 180 years. We are proud of our Scottish heritage.
“[But] the one thing I will always keep under review is the competitiveness of our business.”
The Edinbugh-based company yesterday reported that its UK profits dropped 6 per cent last year as economic uncertainty and volatility returned to hit confidence.
The decline to £220 million was offset by cost cuts and a much stronger result in Canada as the business reported a better-than-expected 28 per cent rise in full-year profits to £544m.