John asks 'Who is Sue?' Answer - It's Sue Akast.

There is a New Zealand potter Sue Mills who signs her work SUE -
you can see her mark on page 85 of the potters marks book.
I have only seen her mark written - not stamped ....
but potters change their marks over and over.....
That's the best that I can do John

Woop woop!! Quite by chance I found out who the real SUE is today!!
Sue Akast who is a potter from Waiuku. She has a website and still makes lots of birds

Here is another Sue Akast log. It was in the garden in a house my daughter has just bought.  It has very realistic bark texture and a lovely little piwakawaka.  
Ev you might want to use this sharper pic of her mark in the gallery, and here is her website.
http://www.potterybysue.co.nz/about.htm
This log is quite tall at 35 cm.

Thanks for that clear mark. I will replace the one in the Gallery