It comes as no surprise to learn from a report by the National Audit Office that both princesses have been living rent-free in royal palaces for more than two decades.

Royal expert claims Charles is footing the bill for his nieces as part of a deal with Andrew to leave Royal Lodge

A report by the National Audit Office has laid bare some of the cosy deals that working - and non-working - royals have benefited from when it comes to residences.