Peter, not sure which of the many documents you refer to in particular but you will no doubt realise that there are different requirements associated with different types of equipment.
It was not my aim to get into a discussion on the right or wrong way to assess competency, rather to provide a stimulus to others seeking a starting point for their own competency documents. Indeed, my understanding is that NAMDET (
http://namdet.org/) are hoping to embark on developing UK national competency documents. If you're not already a member I would urge you to join and add your experience to those already there.