Background
He was the eldest son of Edward Lucas Ridsdale of Rottingdean, Sussex and the brother of Lucy Ridsdale, who married Stanley Baldwin.
He was the eldest son of Edward Lucas Ridsdale of Rottingdean, Sussex and the brother of Lucy Ridsdale, who married Stanley Baldwin.
Ridsdale was educated at University College School and the Royal School of Mines.
He was chairman of the Executive Committee of the British Red Cross Society from 1912 and 1914 and deputy chairman from 1914 to 1919. He was a Fellow of the Geographical Society.
28th United Kingdom Parliament]
He served as Member of Parliament for Brighton from 1906 to 1910, when he did not stand for re-election after disagreeing with government policy.