THE Queen was thrust into the centre of the debate over Scottish independence yesterday after reports she had expressed concerns about the potential break-up of the UK.

It was suggested that after the SNP’s Holyrood landslide on May 5, Her Majesty met Prime Minister David Cameron at Buckingham Palace to discuss the implications of separation for the monarchy.

It was also reported that palace officials asked Downing Street to bring a constitutional expert to advise on a referendum and the dismantling of the Union if there was a “yes” vote.

Last night, Labour and the Liberal Democrats insisted it was understandable the Queen should share the concerns of people about the break-up of the UK but the SNP Government dismissed the reports.

Scottish LibDem leader Willie Rennie said: “The Queen is identifying potential threats to the UK and she is correct to seek the advice of politicians and experts on this because the threat to the Union is now very real.”

He called on Alex Salmond and his colleagues to outline the cost of independence to the Scottish public, adding: “The voters deserve to know exactly what the terms are on which they will make a decision.”

A Labour spokesman said: “Reports the Queen is concerned about the break-up of Britain would be hardly surprising as so many people are concerned about what they now see as a threat to what has been one of the most harmonious, productive and successful political, social and economic unions.”

The Scottish Government said reports of the Queen’s concerns were “unadulterated rubbish, laughable nonsense and chit-chat from London-based journalists and politicians”.

A spokesman for the First Minister said he had many opportunities to speak to the Queen, and was due to meet Prince Charles this week.

The Queen owns large tracts of Scotland, most notably her estate at Balmoral. Last year she struck a deal to get extra money from the Crown Estate instead of an increase to the civil list.

One concession Mr Salmond is seeking is for the Scottish Government to benefit from profits from offshore windfarms along the coast currently controlled by the Crown Estate.

The latest row broke out as a key economic adviser to Mr Salmond, Professor John Kay, warned Scotland would gain little from independence. He said the move was economically viable, but whether Scotland would be better off after separation was “much less certain”.

The economist, one of the Mr Salmond’s Council of Economic Advisers, said: “In the short run, that would depend on transfers and subsidies to the Scottish Government from the rest of the UK. In the long run, the issue is whether independence would promote economic dynamism in Scotland or lead it to sink into the partisan petty corruption that, for so long, characterised Scottish politics.”

He said there was virtually no chance a referendum would agree to independence, but the likely outcome would be support for greater fiscal autonomy.

Last night the SNP played down Mr Kay’s remarks and highlighted those of Andrew Hughes Hallett, professor of economics at St Andrews University, who backs independence.

A spokesman said: “The debate between them reflects a debate across Scottish society.”