 After WWII Seely & Paget designed new churches including St Andrew and St George Stevenage, the largest parish church built in England since 1945, and restored many buildings after ward damage including Lambeth Palace and Eton College, and many London churches.In 1947 John Seely was Surveyor of the Fabric of St Paul's Cathedral and designed the Chapel of the Order of the British Empire, at the eastern end of the crypt.He also appointed was architect to St George's chapel, Windsor Castle and Lay Canon and architect at Portsmouth Cathedral.