Mattrom, I too wondered about that. The only idea I came up with is that maybe it should have been 'quantity' rather than 'quality' - 'qs', meaning 'quantity' is in Chambers, and that would leave the correct letters for an anagram.
Hi malone and mattrom, I thought it likely that something like "special" before "quality" got lost in the proofing. This would at least "remove" the required letters in order.
Thanks, Ginger, that makes sense and definitely works better. I didn't like the disparate nature of the 's' and 'q' being removed for my parsing, but I was determined to find something!