"web design derby" is not in your anchor text. If you want to rank better for that it needs to be an exact match - for instance
- <a <span="">href</a><a <span="">="</a>http://bluecreations.co.uk/">Blue Creations 2012
Web Design Derby
That being said, the same anchor text globally on the footer of every site you make could get you penalized. If you are going to go this route at least make a different link for each site. Point to different internal pages and use different anchor texts for each site you build for someone.
find strongest primary and secondary matches