Interestingly, the RAF Flight Information Handbook states:
'A secondary task is to provide a navigational 'training fix' service to pilots at flying training units.'
i.e., to practise the use of D&D without the need for a full Practice Pan call.
The CAP413 interpretation is obviously different to this; it originates from the time a few years ago when the revamped fixing system was introduced and knowledge of areas of coverage and operator proficiency training was needed.
Lost pilots using D&D responsibly are to be commended; dishonest use of a 'training fix' is merely crying 'Wolf!'.
Sorry - but your last sentence has lost me......