Christabel and Emmeline Pankhurst on the roof at Clement’s Inn, London, October 1908, via LSE (London School of Economics) Library Commons on flickr. A note on the back of the photo says that they were hiding* from the police.
At the time of the photo, numbers 3 and 4 Clement’s Inn† housed the offices of the Women’s Social and Political Union (WSPU), which Emmeline had founded in 1903. The organization was an all-female group campaigning for women’s suffrage and was known for its physical confrontations with police, hunger strikes, and arson. Christabel was Emmeline’s oldest daughter and eventually took over leadership of the group. At the outbreak of WWI, both women called for a halt to WSPU militant activities in support of the war effort and became involved in the “white feather” movement, handing out the traditional symbol of cowardice to men in civilian clothes.
There’s an interesting history of the Pankhurst women (there were two more daughters, Sylvia and Adela) here.
* A warrant had been issued for their arrest. After the photo was taken, they went down to the street and were arrested.
†Located about here. The Clement’s Inn buildings, built in the 1880s, were five to seven stories high and housed both offices and apartments. They were all demolished by 1977. The photo above was taken from the roof garden of the apartment of another WSPU member.