My local library in the late 70s/early 80s had an extensive collection of both New Worlds and New Writings, plus a vast array of Gollancz yellow jackets and a far number of Dobson -- although I hadn't made the connection then on Dobson being a library imprint.

Speaking of Philip E High -- yep, they've got him too. I wouldn't mind re-reading Sold For A Spaceship again. I forsee spending in my near future...