I think it's worth noting that qualifications and experience alone do not make you a competent person I'm afraid. You have to be specifically registered as a "competent person" and that doesn't mean just having professional registration, it is specific to the new codes. I have a HNC in Electronic engineering, a BEng in electronic engineering and am registered as a Chartered Engineer with the Engineering Council via the IEE, yet I am not considered competent!
Having said that, I'm reasonably sure Johnny Thunder is correct that fitting a standard socket outlet is allowed anyway. Besides, if you electrocute yourself or blow the rest of your ccts, who are you gonna sue??
Link
HERE to IEE regs about Part P. Would be grateful if someone could confirm the link is OK just in case it's a members only page.