By the early 1930s the Hampstead School had rapidly grown and the New End site no longer met its requirements.

In January 1934 the Headmaster, Reverend Arthur Wells, moved the school again with its 32 pupils to the present location at Woodhall Estate in Watton-at-Stone in Hertfordshire.

However, the original structure named Woodhall was a large Tudor Manor that was positioned at the top of the Avenue and was home to the Boteler family until the 1770s.

[7] It was Philip Boteler (d.1592), who gained the warrant to create a common around the house and thus founded Woodhall as an estate.

[4] The house with the surrounding land was then purchased by Samuel Smith (1754–1834), a banker and a Member of Parliament, from Nottingham, in 1801.

The contents of the house were dispersed and it became a school, later called Heath Mount School, in 1934. Notable former pupils from the school include Cecil Beaton, Gerald du Maurier, Esmond Harmsworth (Viscount Rothermere), Derek Walker-Smith (politician), Peter Tapsell (UK politician), Evelyn Waugh, Arnold Bax, John Lewis, Callum Ilott, Brooklyn Beckham and Jodie Williams.