I've Just checked out the Airlines website mentioned above & both the Jersey Airline section & the Intra section contain significant inaccuracies. It makes me wonder about the rest of the site.
The best work of reference on older British Airlines is "British Independent Airlines 1946-1976" Available from the Aviation hobby shop. I hasten to add that i have no connection with this work but can vouch for its accuracy certainly in the case of Channel Island Airlines.