@Leeneia: Although the BGS has statutory rights of access to records, core and samples from boreholes drilled to depths greater than 30 m for mineral exploration and 15 m for water supply assessment, most of the records held in the collections are from boreholes of shallower depth, that have been deposited voluntarily. Offshore the data is captured by legislated reporting requirements. It is also an online resource for the public, academics and anyone else http://mapapps.bgs.ac.uk/geologyofbritain/home.html I have logged kilometers of core but only delivered it twice to the geological survey. Once in Snowdonia after drilling Snowdon for copper and the second time delivering core gained from Dover to Folkestone. This was delivered down to one of the wartime tunnels under Dover castle. A tedious hike carrying 4" coreboxes. The main collection is in Nottingham. Any confidential data held is only released with the owners consent.