BOAC
He may be a fool but he was being a very clever fool because his weasel words and dissembling drew attention away from the inconvenient facts that;
1. According to the AAIB the SuperTANS (display) was switched off, yet MoD's case revolves around it being on until impact and not adversely affecting, or being affected by, other systems (which it was known to).
2. Inexplicably, the SuperTANS manufacturer was allowed to write its own unverified report, whereas the GPS report was written by the AAIB.
3. The two (SuperTANS and Trimble 8000 GPS) were not considered as a "system of systems" at any time and the conflicts between the reports not reconciled by an independent party. Notably, the majority of the SuperTANS report was withheld; perhaps it was a coincidence that this part contains the data which reveals the conflicts.
4. The data extracted from the SuperTANS (by unvalidated and unverified means) was presented by MoD as absolute proof the entire Nav System was both serviceable and accurate. In making this claim, they conveniently ignored the fact none of the Nav System was cleared for use.
5. The GPS had multiple faults, including Time of Day (something quite important in a GPS) and in the power supply (quite important in any avionics).
That is, MoD based their case on a system they had admitted they had no confidence in and had not released to service.
I think the Americans call it "fruit of the poisonous tree". Because the system was deemed unfit for service use at the time, then any evidence relating to it is tainted. Rather like Day in fact.