Onceapilot
Having scanned the report again tucked away there do seem to appear to be a few "open items", mainly in the appendices, mainly in Human Factors: e.g.
It was not known at the time of writing this report what caused the loss of thrust (such as pilot action, technical fault, etc) and so no HF analysis has been undertaken of it. However, in the course of the analysis of the in-cockpit video it was considered whether the pilot was aware of the loss of thrust and, if so, when. Such analysis assumes that the loss of thrust was not initiated by the pilot intentionally. If subsequent work by AAIB identifies that the pilot intentionally reduced thrust during the climb, then the analysis presented in paragraphs 17 and 18 is invalid.
elsewhere:
At present it is not known if the altimeter was serviceable and displaying the correct altitude during the loop. Technical analysis is on-going by AAIB which may provide further information on this point.