A few (public, open) datasets that we have used are reproduced here where licence and size permit. They are not necessarily in a format that can be consumed by the pipeline (see datasets for some examples that are).
rft-teaching-file: 2011 Census: Teaching FileCensusUK2011_Aggregated_Sex_Region: 2011 Census aggregate data, UK Data Service http://dx.doi.org/10.5257/census/aggregate-2011-2SimpleWorld: Simple example from Spatial Microsimulation with R