Sounds good. I've never heard of the Hummingbird Bakery, but the Book People dropped off some books for us to look at this week, and there is the CUTEST tin of Hummingbird Bakery notecards with pictures of cupcakes on the front and recipes for them on the back (like blank inside sort of notecards) with pink envelopes. So cute and girly. Me wants! 
Hummingbird bakery is lush Jewlz!
The one on South Ken is my favourite haunt, but the portobello Road is the original I believe.
They do American sweet pies, key lime, mud, pecan, pumpkin etc
The cookbook is definitely on my Amazon wish list, I'll have to pick it up sometime
