Doesn't the actual legislation just state that you have to be competent? If it's DIY, that is.
https://www.euskills.co.uk/wp-content/uploads/2017/12/Gas-Safe-Competence-Review-Report-2011-2012.pdf
I'm guessing competence means more than just decent at stuff but I might be wrong.
@Airhead started
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Doesn't the actual legislation just state that you have to be competent? If it's DIY, that is.