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Prime Minister Ramsay MacDonald was among those who backed the campaign - he would even go on to arrange for Wain's sisters to receive a small Civil List pension to recognise their brother's services to art.

The Civil List was replaced in 2010 by the Sovereign Grant.

What Margaret didn't do was tell her lover that actually, "The penalties for us marrying are pretty minor. I've got to give up my position in succession to the throne. As for the rest of it, you might get a title, and you might get some money from the civil list."

Prince Charles, who largely underwrites Harry’s income from Duchy of Cornwall revenues, is promising to tighten the purse strings if his son’s commitment to royal duties is halved – a threat that proved successful when Princess Margaret gave up her love for Peter Townsend in the 1950s in order not to lose her title or civil list money.

On their new website, sussexroyal.com the couple said they received just 5% of their funding for official duties from public money through the sovereign grant, the formula for funding the monarchy that replaced the civil list in 2012.