From the information that is available in the AAIB bulletin, I’d say that although one may or may not agree with the captain’s actions (personally, I tend to agree, since the instruments did not indicate a problem, both engines were running, and there were airports everywhere along the route), one thing is clear: there was no definitely wrong action! It’s all a matter of right and more right.
Johnny, your profile shows that you’re a PPL pilot. Don’t worry too much about what the pros are doing, they’ve been trained to handle situations just like this one. Relax…