Atkinson's farm, properly called Atkinson's Ground by natives (PP18) is not far below High Topps. In Pigeon Post the SADMC hope to get milk there, until they find that the farm is occupied by their enemy Squashy Hat. John even sees a copy of Mining World on the window-sill. So they have to go to Tyson's Farm (PP4,6).
There are three men there, and Mrs Atkinson (PP34,6).