Sign up now for FREE unlimited access to Reuters.comSign up LONDON, Sept 10 (Reuters) – Prime Minister Liz Truss will accompany King Charles on a tour of Britain’s four nations to mark days of national mourning for his mother, Queen Elizabeth, her spokesman said on Saturday. Truss, who was appointed prime minister by Elizabeth on Tuesday in her last public act, was one of several senior MPs who swore a new oath of allegiance to the new king at a special session of parliament earlier on Saturday following the queen’s death. She was also present, along with six former prime ministers, senior bishops and several politicians, when Charles, 73, was officially named Britain’s new king in a colorful ceremony full of pageantry and tradition. read more She later met Charles along with other senior ministers at Buckingham Palace. “As for the prime minister’s participation, she will join the king as he leads national mourning across the UK, attending memorial services in Scotland on Monday afternoon, Northern Ireland on Tuesday and Wales on Friday.” the spokesman said. reporter. Sign up now for FREE unlimited access to Reuters.comSign up Reporting by Alistair Smout, writing by Elizabeth Piper. edited by Michael Holden Our Standards: The Thomson Reuters Trust Principles.