They were there first. CORGI came about to get rid of cowboy operators. The old gas boards were not cowboy operators. The likes of BG/Transco has a monopoly, so they should specify a minimum training level, and quals, and that is it. Then CORGI gives a certificate to Transco/BG men. It is ludicrous that they should pay to sit a test if they leave.
BG/Transco have QA depts, so are monitoring quality.
They can, it depends on how big they are.
An independent body can monitor how self certification is being implemented in organisations. SElf certification may only be to organisations of a minimum size.
The system needs updating.