William and Kate are travelling to Scotland for a two-day tour which will see them visit a range of projects today from Glasgow's Sir Chris Hoy Velodrome where cyclists will be training, to launching a new Scottish project for their foundation.
The initiative is a pilot scheme which aims to inspire and train the next generation of young sports coaches.
The 18th century mansion was bought, along with its contents and adjoining land, by a consortium led by the Prince of Wales in June 2007.
Charles, known as the Duke of Rothesay in Scotland, will join his son and daughter-in-law as the Manoukian Foundation, a new outdoor centre for uniformed youth services and schools, is opened in the grounds.
The couple are known as the Earl and Countess of Strathearn when in Scotland - a title bestowed by the Queen to mark the Duke's marriage - and tomorrow they will travel to Dumfries House in Ayrshire.
The visit will be marked by a fly-past of three Typhoons from 6 Squadron, RAF Leuchars - a base close to St Andrews University in Scotland where William and Kate first met as students.
The royal couple will then travel to Barrow-in-Furness, Cumbria to learn about the new Astute Class of nuclear powered submarines being built for the Royal Navy by BAE Systems.
More top news
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."
After the PM triggers Article 50, Britain will need the other EU nations to agree to deals. Gibraltar could be key to Spain's demands.