As far as I - and, I suspect, most casual WHO fans were concerned - Downie was (if you cared at all) a sometime member of the show's production team. Even the fanzine DWB at its most vicious seemed to stop short of revealing that Downie was also the long-time partner of series producer John Nathan-Turner.
That - presumably - explains how he was able to get recurrent gigs on the show, especially on those rare excursions overseas. The very existence of this book may have been publisher WH Allen (better known for their copious Target Books paperbacks) attempting to curry (ahem) favour with the producer of their biggest, and most lucrative, licensee. Maybe the license was up for renewal....
If Poundland had existed in 1985, I feel sure their branches would have been overflowing with this debacle by the end of the year.
For the full JN-T/ Downie story, you ABSOLUTELY have to read Richard (ex of BLUE PETER) Marson's biography, published by Miwk. It's a compulsive page-turner which generated headlines by revealing that both had an eye for the younger (and, at that time, underage) male fan. But, beyond the scandal, its a fascinating account of a (sometimes destructive) relationship which spanned decades as well as a detailed insider view of how BBC Television operated and - ultimately - turned its back on the show and its producer.