I got the survey email but deleted it! Then I read this thread and realised the collection was indeed worth having. Have just checked Trash and it has gone from there so my email efficiency has cost me! Idiot!!
But never mind, I shall just console myself that I didnt want everything and buy the Shay and Blue sets.
Following on from this, I received a reminder today that I hadn't completed the survey and still offering the bag. So I did it and will hope for the voucher to come through. Fingers crossed, although sorry for those who haven't even had one approach.