 Walsh returned to England from Mauritius in 1897 to take up his appointment as Canon and Archdeacon of Canterbury and Assistant Bishop to Dr. Frederick Temple, who had become Archbishop of Canterbury in the previous year.In 1898 Walsh became Suffragan Bishop of Dover and in 1901 he was appointed chaplain to the Lord Warden of the Cinque Ports.Walsh published the "Progress of the Church in London During the last 50 Years" (1887); this was updated in 1908 and re-titled "Progress of the Church in London; from the Accession of Queen Victoria to 1908".