Prince Charles and William warned they'll need to be 'more circumspect' in future role

The Queen's heirs will not be able to let their feelings known on some topics when they

eventually become Kings, according to a royal author. Biographer Ian Lloyd said the title

of Prince of Wales grants more wiggle room than the one of sovereign, as Prince Charles has demonstrated over the decades.

Reports have suggested Prince William plans to ditch the Queen's mantra "never

complain, never explain" and be more outspoken on certain issues, in a bid to further modernise the Firm.

Asked about these claims, Mr Lloyd said speaking out and providing

views on some matters can be done more by the heir to the throne than the monarch.

Speaking about how Prince Charles has navigated the role of Prince of Wales while also

making his views on issues close to his heart known, Mr Lloyd continued: