In May 1914, encouraged and helped by an American resident of Melbourne, Hugo Meyer, Gilbert went to London and in spite of the war persevered with his work as he was well over military age .
He exhibited at the Royal Academy where the sincerity of his work met with early appreciation, and in 1917 his marble head "The Critic" was purchased for the Tate Gallery through the Chantrey Bequest.
[3] Another important work was the group of three figures for the Matthew Flinders memorial which stands outside St Paul's Cathedral, Melbourne.
Gilbert had always been accustomed to doing everything for himself, and wore himself out carrying clay for the huge full size model and died suddenly on 3 October 1925.
He married again while in London and left a widow, Mabel Annette Gilbert, née Woodstock, with three children, daughter Marj, and identical twin sons, Charlie and Jim.