Thanks vilas, pineteam....overthinking tends to be an issue for me for sure! and what we did was at low altitude, and was the memory items for unreliable airspeed (albeit badly executed by me!) due to doubt as to PFD (CM2) reliability. And then level-off and verify (using eQRH) as the plan to confirm the serviceability/reliability of my PFD airspeed (i.e. if pitch and power matches approx., then reasonably assured that it's working and reliable in absence of anything else). Perhaps I need to memorise some pitch/power settings as a back-up? although I'm not a fan of such things because of the possibility of mis-remembering and inducing errors where there were none ;-).