It’s no secret that Prince William and Prince Harry’s relationship has been pretty icy for some time now, but Queen Camilla’s son has shed fresh light on their troubles.

The brothers were once so close that they seemed to the public totally inseparable – and the challenges both went through together in their young life with the loss of their mother Princess Diana meant that the brothers shared a complete understanding of what growing up in the royal spotlight really meant.

And in a new interview, William and Harry’s stepbrother – Tom Parker Bowles, 49 – opened up about his impressions of the challenges they have faced. Queen Camilla’s told The Telegraph that even though his own experiences with this kind of public scrutiny were far less intense than what William and Harry had dealt with, it gave him a sense of the difficulties they endured, particularly as they were growing up.

Tom – a broadcaster and food writer – is the eldest child of Queen Camilla and her first husband, Andrew Parker Bowles, and saw firsthand the intense public attention that his mother received due to her romantic connection to King Charles during the monarch’s first marriage to Diana.

In his younger years, he got a taste of the constant scrutiny that his stepbrothers William and Harry have been under their entire lives, and called what the brothers have been put through “appalling”.

“I remember being chased at 100mph by paps trying to get a shot. My mother being screamed at to try to get a reaction. Pushing, jostling. It was horrific, and you are protective of your mother. Counting how many paps were at the gates, to see who was watching us and taking photographs: it was all as normal as bacon and eggs in the morning. You didn’t think of it in any other way … [But] it was barbaric.”

While Tom showed some hesitance to speak about his stepbrothers, he could not help but express sympathy for how much worse they have had it. “I learned a long time ago not to put my fat fingers into the world of William and Harry,” the food writer said. “But it was appalling what they went through. I’ve had a billionth of what they’ve had to go through but hell, I sympathise.”

Camilla and Charles were romantically on and off for decades, but it was only in 2005 upon their marriage that William and Harry gained two step-siblings, Tom and Laura, 46