There, that wasn't so hard, was it?
Define "Training Flight"
If the IMC test were failed, or God forgive the candidate did not have a valid medical, it could only be logged as Dual!
The definition of "Dual" implies instruction.
‘Dual instruction time’ means flight time or instrument ground time during which a person is receiving flight instruction from a properly authorised instructor.
The original purpose of the Dual flight was copied directly from the FAA before being "Eureobuggered" its purpose is clearly nothing to do with the SEP class, rather, it is to ensure some level of exposure to a controlled environment, instructor examiner etc. The UK has issued an Alternative means of compliance, 3 x 20 minute flights with the same instructor, realistically 30 minutes airborne time just enough for 3 separate circuits. If that is good enough, the content of an IMC test may be well over the top! At the end of the day, we have to trust the instructor, some beaurocrat, who can't instruct, sitting in an office pontificating over what is or isn't instruction will achieve nothing. Its worked for 13 years, what is the safety issue?