LONDON (Reuters) -Britain’s Queen Elizabeth will miss next week’s Commonwealth Service, Buckingham Palace has said, in what was due to have been the 95-year-old’s first in-person public engagement since being advised to rest by her doctors. The world’s oldest and longest-reigning monarch, has been little seen since she spent a night in hospital last October for an unspecified ailment, and was then instructed by her medical team to rest. Last month, she tested positive for COVID-19, suffering mild cold-like symptoms, but was well enough to meet Canadian Prime Minister Justin Trudeau at Windsor …