I spent a large part of my pre- and early teens reading between as many yellow covers as I could. I have fond memories of Gollancz and when I saw this 8 book set from theit 50th Anniversary issue for just £7.99 incl delivery, I could not resist. You can get this set for a fiver now.
I’d love to have the entire set of 50 but I am supposed to be de-stuffing in readiness for house-selling.