The National Museum of Computing (TNMOC) at Bletchley Park, Buckinghamshire, has been at the centre of efforts to fill the gap and ensure the full story of wartime computer development is told.
By chance Kevin Murrell, one of the TNMOC's trustees, spotted the control panel of the Witch in a photograph taken by another computer conservationist who had been in the municipal store seeking components for a different machine.