Competent person scheme
The Competent Persons scheme was introduced by the UK Government to allow individuals and enterprises to self-certify that their work complies with building regulations as an alternative to submitting a building notice or using an approved inspector
A Competent Person must be registered with a scheme that has been approved by The Department for Communities and Local Government (DCLG).
For more information you can look at the competent person website
To understand why you should use a Competent Person, Download the consumer booklet.