The borehole information pack from borehole TH0420 at the UK GeoEnergy Observatories (UKGEOS) Cheshire facility. This release from the British Geological Survey (BGS) contains a borehole schematic, borehole metadata, a report from the drilling contractors, geophysical wireline logs, metadata relating to the multilevel sampling installation and an index to samples collected from the borehole, which are archived in the National Geological Repository at BGS Keyworth. No core scanning data is available for this borehole but the core has been refrigerated in sealed liners for future sampling. This datapack supersedes a previous version of the datapack which was available at https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186985, https://doi.org/10.5285/f58c10f1-58be-463f-8032-953edae06e9f. This updated version contains minor corrections to the borehole schematic.