Was there an earlier almost identical crash at site? BEA?
I have read the link, did Thorney have radar and a ndb by this time? Why does the author of the site harp on about Thorney being closed on a Sunday, Tangmere would have been open.
However I would observe that frequently civil aircraft flew east of The Wight rather than St Catherine's - Petersfield, however when ever this was the subject of a complaint it was always denied.