Well, you got me with that one as I have only read the first two LoEG volumes and was completely unaware that Messrs Moore and O'Neil had referenced those old British characters.
The Quatermass thing is very interesting given the stuff on one of your links. The mutation in Quatermass Experiment is of course one of the astronauts, Victor Carroon (have I spelled that correctly?). And Bernard Quatermass receives a mention in the Doctor Who serial, Remembrance of the Daleks, as does the British Experimental Rocket Group.
Jet Ace Logan is a particular favourite of mine and I've been aware of his adventures since I was a young boy and I seem to remember that Charteris was also referred to as "Buster" but that might have been in later reprints because "Plumduff" and "Chubby" (which I think was also used) were considered a bit non-pc. But I think it's pushing it to try and tie up Prof. Q and Logan. The continuity in Logan stories really doesn't exist, despite them being highly entertaining.
I realise we're talking about creating a variant universe, but tying up Dare, Morgan, Logan and Quatermass, while absolutely intriguing, doesn't really work for me. The technology differences in their stories is enough to make it difficult to reconcile. Given the references to Quatermass in Doctor Who, would you not also have to include a Dr. John Smith in the mix?
Right, as for your request, I would love to be able to lay my hands on scans of those British comics but some of us on here are seriously good at digging up wee gems like that and up to now we haven't found them. Rest assured, we're always looking but it takes time - if they are to be found at all, that is.
Vull in Ranger interests as I didn't know of the character and there are a few issues floating about, but don't get your hopes up