[1] Flatman was sent to Holloway Prison,[2] after she took part in the raid on the Houses of Parliament in 1908, led by Marion Wallace Dunlop, Ada Wright, and Katherine Douglas Smith, and a second wave by Una Dugdale.

[5] Flatman arranged humble lodgings for Constance Lytton when she came to Liverpool disguised as a working woman, aiming to get arrested for suffragette activism to created suitable publicity.

After the speech's were given and a guard turned his head to speak to someone, Flatman pushed over a 10 foot barricade and ran into the room, shouting "give votes to taxpaying women!"

She threw hundreds handbills in the suffragette colours of green, purple and white into the crowd which asked for Liberal men to support women's enfranchisement.

In a contemporary newspaper account in the London Evening Standard, suffrage campaigner Frances Ede described how stewards dragged Flatman from her seat and removed her "with quite needless violence".

When the 1911 census was taken, Flatman organised "a midnight super party" at her home at Bedford Lodge, College Road, Gloucestershire, so that a group of suffragettes could evade enumeration.

[17] When the Liberal Government Minister Charles Hobhouse spoke in Gloucester's Shire Hall, Flatman vainly tried to ask him questions about women's suffrage but was ejected.

[2] She had also kept a scrapbook of her suffrage adventures, now held by the Museum of London,[3] and also donated a breakfast loaf that she had brought out from Holloway Prison and preserved as a relic of the cause.