Welcome to EH-Net.
If there is a course specifically dealing with UK laws, and that is your main focus, then I would take the advice of your friend.
On the other hand, you may want to focus on the technology more than the laws. Most of the certs such as those listed on this site:
http://www.ethicalhacker.net/content/category/1/29/3/will deal heavily on the tech and less on the laws. If they do, then the laws they focus on will be more US laws.
Then there's always the question of what you value most... the cert or the knowledge. The certs listed at the link above will be more well known but may not give you exactly the knowledge you want.
Hope this helps,
Don