British Queen Elizabeth II (C) arrives to attend a service marking the 750th anniversary of the rebuilding of Westminster Abbey in London, Britain, on Oct. 15, 2019. (Photo by Ray Tang/Xinhua)

British Queen Elizabeth II (L) departs after attending a service marking the 750th anniversary of the rebuilding of Westminster Abbey in London, Britain, on Oct. 15, 2019. (Photo by Ray Tang/Xinhua)

British Queen Elizabeth II departs after attending a service marking the 750th anniversary of the rebuilding of Westminster Abbey in London, Britain, on Oct. 15, 2019. (Photo by Ray Tang/Xinhua)

British Queen Elizabeth II departs after attending a service marking the 750th anniversary of the rebuilding of Westminster Abbey in London, Britain, on Oct. 15, 2019. (Photo by Ray Tang/Xinhua)