Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
Beaton was a colleague of script editor Douglas Adams from his days as a comedy writer. Him and Dunant were commissioned on 12 December 1978. Their scripts were rejected on 9 January 1979 as being unacceptable. (REF: DWMSE 9)