WATCH: Cameron, 'Don't Break Apart Our Family of Nations' to Give 'Effing Tories a Kick'

British PM David Cameron appeals to 'the heart,' pleading with Scots not to break apart their family to punish his party. 'I care more about my country than my party.'

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REUTERS - Scotland is set to vote on Sept. 18 on whether to sever its 307-year-old ties with England and break up the United Kingdom, with latest opinion polls showing that the race is too close to call.

More than 130 business leaders recently signed a letter calling for the UK to stay together, while about 200 business leaders are standing firm on the other side of the debate.

Following are comments of Britain's top companies and firms with operations in the UK on the Scottish referendum:

Sept. 11

Royal Bank of Scotland Group Plc warns it "would be necessary to re-domicile the bank's holding company", if Scots vote for separation.

Ad firm M&C Saatchi Plc says keeping track of the referendum as its largest UK client - the Royal Bank of Scotland - may relocate to England if the UK is split.

TSB Banking Group Plc, which is part-owned by Lloyds, says may relocate some operations to England should Scotland vote for independence.

National Australia Bank Ltd says contingency plans for its Scotland-based subsidiary, Clydesdale Bank, include moving to England if Scotland votes to end its union.

Sept. 10

Part-nationalized British bank Lloyds Banking Group Plc says contingency plan includes setting up "legal entities in England", if Scotland votes for independence.

BP Plc Chief Executive Bob Dudley says he hopes Scots vote against independence because the United Kingdom would better provide the stability required for long-term investment in the oil-producing North Sea.

Edinburgh-based insurer Standard Life Plc says the referendum would have no impact on dividend payments or its London listing and reiterates it could transfer business to England if necessary.

The head of one of Britain's largest defense suppliers, France's Thales SA, voices concerns over jobs and investment if Scotland votes to leave.

Sept. 3

If Scots vote to break up the UK, it would cost everybody money, says Tom McPhail, head of pensions research at fund supermarket and financial advisor Hargreaves Lansdown Plc.