I feel like the BBC's reporting on Israel/Palestine improved after the 2014 Gaza war (Operation Protective Edge), largely IMO due to on the ground reporting on social media which had not really existed before.
Seem to remember a few examples of pretty egregious pro-Israel bias in their early reporting of that conflict, which was subsequently criticised. Things do seem more balanced now on the whole, whether my hypothesis holds any merit is debatable, but that's the way it has seemed to me