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If you go to site settings in webmaster tools you can set your geographic target to United Kingdom which may help.

Thanks Andrew! I was being a bit blind there - good spot.

Hey Jarno, Thanks for your detailed response. I will look into the calculations as a method. I also think doubleclicks policy is completely nofollow, I was just looking for some confirmation. Thanks.

Hey Joseph, You are absolutely right. Our main aim is always to get registrations to the site and build our database and we try and do this by advertising good jobs that make people want to sign-up! Thanks for all your help on the matter, if you think of anything else, don't hesitate to let me know. Cheers.