BHO was founded by the Institute of Historical Research and the History of Parliament Trust in 2003. Our collection currently contains over 1,270 volumes and is always growing.
To 30 September 2020 we're making all transcribed BHO content freely available for individual users. This adds 200 volumes of primary materials. As a result, BHO's full complement of 1280 volumes is now available for research. Read more about this new free content.