There is a Dora Browne in the 1911 census who looks very promising: https://www.familysearch.org/ark:/61903/1:1:XWBZ-1XX
She was born in St Pancras, and listed as the adopted daughter of Thomas Leech Browne and his second wife, alongside their two sons - and the relative ages of the five of them look like a good fit for your family photo. Cadishead / Irlam is just west of Manchester.