A royal expert has claimed that Prince Charles has a particular quality that will make him "unsuitable" as the King of the United Kingdom after his mother, Queen Elizabeth.

According to Clive Irving, the author of the new biography The Last Queen, Prince Charles, 72, could be relatable as an 18th century figure. However, he's not a timeless and more modern person than Queen Elizabeth, 94, the longest-reigning monarch in Britain's history.

Irving said that Charles has the tendency to "impose his taste" on people and keeps the "sycophants around him," thus making him unfit to be a ruler. The royal author strongly believes that the monarchy will be "over the cliff" when the Prince of Wales finally sits on the throne because he will refuse to modernize.

The royal expert also said that Britain has probably seen the last of the greatest female monarchs with Queen Elizabeth. Her heirs after Charles are also male -- Prince William and Prince George.

Irving's assessment comes as the Prince of Wales is due to take on more responsibilities this year. In August, Charles will become the patron of the Grinling Gibbons as it celebrates its 300th anniversary.

According to Daily Express, Charles' new role will be good for 12 months only but it will be a significant one since he will be sponsoring many of the initiatives of thousands of local woodcarvers. The Prince of Wales has long been an ardent supporter of craftsmen and everything "Made in the U.K."

He apparently plans to hold a national exhibition to mark the group's tercentenary if the public health crisis improves. The Prince of Wales also wants lectures and debates as part of the celebration to get more people involved in conserving, supporting, and sustaining this heritage skill.

The temporary patronage of the Grinling Gibbons works for Charles because previous monarchs like Charles II, James III, and William III have also been patrons of this organization before they became kings.

Meanwhile, the Prince of Wales said that he would get the vaccine against COVID-19 in due time. However, he's aware that he's not on the priority list and would prefer to wait for the rollout of the British-made vaccine, AstraZeneca.

Charles, who developed mild COVID-19 symptoms in late March 2020, said that he may still have antibodies to the virus, which will protect him a little longer. He praised the vaccine program of the U.K. and hoped that more people would consider getting the jab to protect those vulnerable to the virus.