Yup, although earlier on the phone I was told that all these signatures were required I have now in fact just received the license in the post with some clarification. (They must have sent it yesterday).
They've included a photocopy of their guidelines and highlighted the bit that I "failed" on:
On completion of any course of training, the Chief Flying Instructor (or his representatives) should certify the student's logbook as a true record of the training completed.
I would have thought that the extra sheets of paper with the breakdown of my hours for each course (signed by CFI) would have been enough.. apparantly not, or perhaps they were in a bad mood the day they reviewed my application and were being unnecessarily picky.