Aviation Publication 67
From Aviation Publication 67 (MoD Flying Orders to Contractors):
"102.115.1 An approval will normally not be granted for a pilot to carry out experimental, clearance or development flying, or some categories of research flying, in command, unless the pilot is a test pilot; however, some types of development flying and research flying may be approved for non-test pilots."
In my experience, whilst non-TPs do fly under AvP67, it tends to be for very 'basic' non safety critical tasks. No slur intended on my part against the top chaps carrying out these tasks without the TP qual.
Of note for this particular thread, these rules also pertain to UAV-P.
Sun Who.