Having had many go-arounds I have never experienced sheer panic from passengers. Maybe a momentary look of concern but no screaming or other amateur dramatics, including when we once did a TOGA. Even the once a year crowd soon realise what is happening. I'm sure Jet2 have a procedure where the cabin crew will make a PA once it becomes apparent that a go-around has taken place and the pilots will make a PA late.....but only if time/workload permits. Would they rather them fly the plane or make a PA?