In his 1PM radio broadcast on 12 May 1926, John Reith, managing director of the BBC, recited William Blake's "And did those feet in ancient time" (also known as "Jerusalem")
 to celebrate the end of the General Strike which had lasted for nine days and which the BBC had opposed throughout.
Which version did he use - the one with Blake's original words "these dark Satanic mills", or the one with the altered words "those dark Satanic mills"?
(This information is not included in the summary of that broadcast which is available in Warwick University's collection.)
(See another question which asks about the first usage of the altered words.)