Founded at the Pankhurst family home in Manchester. The headquarters was relocated to 4 Clement's Inn in 1906. Moved to Lincoln’s Inn House in Kingsway in 1912 - 17.
LSE History gives: "... the Women’s Social and Political Union (WSPU) general office was at 4 Clement’s Inn, and had been since 1906.... In 1912, Emmeline Pankhurst moved the WSPU office to Lincoln’s Inn House on Kingsway and ousted the Pethwick-Lawrence’s. ... Emmeline Pankhurst founded the WSPU in 1903, and she, Christabel Pankhurst and Flora Drummond were famously pictured being arrested from Clement’s Inn in 1908. Clement’s Inn now contains LSE offices..."