Martin....I remember all the Quatermass stuff, right back to the original Tv serial "The Quatermass Experiment" in 1953, iirc. There were four TV serials, the three first ones on the BBC...including "Quatermass 2" and "Quatermass and the Pit" and the final one was on ITV and involved the Professor with an alien harvesting of humanity from stone circles. As far as I know, there are three books...being the scripts of the first three TV serials. I haven't come across any other Quatermass books...I would be interested in any other details you can give of the novel to which you refer? Was it written by Nigel Kneale, the original creator?
To get back on topic....I recall the London to New York air race in which the Harrier participated. I believe there was a move to hover the Harrier alongside the Post Office Tower and the Empire State building and have the passenger/conpetitor enter and leave by walking along the wing.....(!)