Briggs and Thornely
This partnership of Briggs Wolstenholme and Thornely was dissolved by the death of F. G. Briggs in September 1921. Arnold Thornely then worked alone but under the style of Briggs and Thornley. From 1925 to 1943 he was in partnership with his elder brother Herbert Lionel Thornely (1868–1944), with offices in the Royal Liver Building, Liverpool. His relationship with H. V. Wolstenholme remains unclear but may concern the lease arrangements on the offices in the Liver Buildings. While no partnership existed, Wolstenholme continued to use this as his business address until his retirement in the 1930s.
Works under the style of Briggs and Thornely included Municipal buildings, Barnsley and Preston; Head Office, Burnley Building Society, Burnley 1926; laboratories for the Geology Department of the University of Liverpool (1927–29); an extension to the Walker Art Gallery, Liverpool (1931–33). However, by far the most important work of his career was the Ulster Parliament Building at Stormont Park, Belfast begun in 1923 and opened in 1932.