According to Wiki, Wallis junior obtained a " doctorate in astrobiology from Cardiff University, having studied evidence for cometary panspermia, under the supervision of Chandra Wickramasinghe."
Wallis junior must have studied well before then, because Chandra Wickramasinghe was dismissed by Cardiff University in 2011 and moved to Buckingham University, a private establishment
There is a page on 'What Do They Know' about Wickramasinghe, Cardiff, Buckingham and Wallis senior, where Cardiff University don't seem to have answered an FOI request.
https://www.whatdotheyknow.com/request/why_did_cardiff_astrobiology_dep
And do look up "cometary panspermia". It's not NSFW, just very much, erm, out there.