Cheers guys, its the first 'proper' bump map I've attempted (apart from a post competition play with the samurai guy).
It took a bit of playing with the bump level to stop things looking huge and grainy but thats all part of the learning process

After having read a few hair paintfx tutorials I'm actually looking forward to getting onto the fur after the bump, color and spec maps are finished

Just for reference this one makes it sound doable:
https://www5.domaindlx.com/htutorial/
(original thread at https://forums.cgsociety.org/showthread.php?t=117063)