I don't actually remember anything at all about the other stories, except that by and large they were far more recent. I don't remember anything at all about the anthology, in fact, except for Antonia Forest, but in spite of that I can't count it a complete waste.
Mary Renault's "Mask of Apollo" features prominently in The Cricket Term; it's the "limited" book that Nicola smuggles back to school and gets in trouble for, which naturally made me go and seek it out immediately. Its shockingness went over my head, unfortunately. Or possibly it's no longer considered especially shocking.
And I don't know how much children's books really did have adult literary references. I have the impression that it was very much one of Forest's signatures, that she could have well-read characters and didn't need to dumb things down for the reader.