If you are told you are low on fuel, you RTB.
If you think there is a defect in a system, you RTB.
If you have been flying a 135 for 1:37, at night, over a city, you should be RTB.
Thanks for that Sky Sports, that's genius, we hadn't thought of that.
But he didn't, did he? He wasn't a risk taker, so why did he do it??
I don't have the answer, but knowing Dave well, I don't THINK he would have been so cavalier in his flying. SOMETHING made him feel that all was ok. Personally, my OPINION is that he saw the same 'picture' as G-NWEM had in the report. It made him doubt the warnings (incorrectly) and when he realised what had happened, he made incorrect switch selections under EXTREME pressure.
So you can't put the switch position thing to bed with the information that has been released in the report. It doesn't exonerate the burden on the pilot, but it could start to explain why he did it.