Other magazines were indeed available to the schoolboy of the time but they were generally placed on the top shelf at newsagents…:D
Unfortunately FlyPast and others of that ilk are now on the bottom shelf at my local WHS, which I can get down to easily enough, it’s just getting back up that I have problems with.
Can’t add anything about OAH-B, but there was a “trial” forerunner of FlyPast in 1980 called Classic Aircraft (a WHS publication), only number one saw light of day (I keep my copy with the reast of my FlyPast mags), although I have been told that number 2 was ready to go, Mike Twite and Ken Ellis were two of the names involved, and the layout was the same as FlyPast when that emerged the following year.