On Wednesday morning, I was hoisted into the air of Whitehall on a cherry-picker. A century ago the proto-Cenotaph appeared in time for the London Peace Parade in July 1919, which followed the signing of the Treaty of Versailles. In that first year, the Cenotaph was only a timber and canvas structure, built to last a week; but Edwin Lutyens’s design seemed so right that the present structure, more precisely designed, was built in Portland stone for Remembrance Day 1920.