The Land Registry holds a nearly comprehensive record of the title history of all registered land, a huge archive of land ownership and transfers. For us plebs this means that information will be freely available, at a cost, to any marketing or snooping organisation. Interestingly it does not hold details of unregistered land, such as estates that have not changed hands since 1956 or so, eg. ageing estates in perpetuity so non-plebs can sleep easily knowing that details of holdings are still obscure and not up for sale.