Certification/training required for domestic electrical installations for a chartered engineer

Hi all,

This is my first post on here, although I've been a member of the IET for a number of years. I have a question which may seem basic but the WWW doesn't give any clear advice.

I have a 1st class masters degree in electrical and electronic engineering, and also hold chartered engineer status with the IET (for 6 years now). Despite this, I know I am not permitted to carry out any domestic electrical installations. So my question is, what certification/training is required to allow me to carry out this work based on the qualifications that I already hold? Ideally, I'd also like to get on to a competent person scheme to allow self certification as well. 

Many thanks in advance