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In 2017, the pontiff said his church enjoyed a relationship of "true fraternity" with the Church of Scotland.

The Moderator of the Church of Scotland, the Rt Rev Dr Shaw Paterson, expressed his condolences following the pope's death.

Ms Fraser says that Warwick, a Church of Scotland minister who had preached to King Charles, had befriended Hugh, Roddy and David years earlier.

He is no longer a minister in the Church of Scotland.

The service will be led by the Rev Dr George Whyte, the former Principal Clerk of the General Assembly of the Church of Scotland.