Thanks once again to the EnterQuest team for pointing out this guide to creating a brand.
It is a short but effective free pdf leaflet on brand creation, if and why you need one, tips on researching brands, and guidance on brand management and extension.
The only slightly odd aspect of the guide is the noticable lack of branding by its authors GREEN Communications. As you can see from this cover shot, their name is barely visible in the bottom right hand corner. You have to read all the way through to the end of the guide before coming across their logo and contact information on the back cover.