There are over 600,000 teachers in the UK, the vast majority of which are women, so 2 cases, not even in the same year, doesn't equal = not uncommon! If anything it's the exact definition of uncommon. Maybe consult a dictionary?
"In broader terms - if we see a class room of girls with a male teacher, do we start to feel a little uncomfortable and would prefer a female teacher instead?"
No?
All teachers should be subject to normal safeguarding restrictions, none of which involve 'you shouldn't be able to teach pupils of the opposite sex to yourself.'
What you're saying is akin to if it chucked it down tomorrow, and you started suggesting that the UK should be more worried about this suggesting flooding in august is a huge issue we should be scared of, while ignoring the 10 weeks of near constant heatwaves which are the actual present problem.
Very few teachers of either sex abuse their pupils. Acknowledging that statistically male teachers are more likely to do so doesn't mean anyone thinks female teachers can't or shouldn't be punished if they do. But it's very uncommon. Judge (and sympathise with, in the case of the victim) the individual, don't extrapolate widely in a moral panic or to make some sort of point.