Are you a teacher? I found the last part of your comment not only unprofessional, but also very arrogant.

"People in glass houses should not throw stones and parents should not moan about accents when they themselves often do not speak English correctly".

Why are you assuming that the parents are speaking english to their children?

As a matter of fact, it is crucial for children whose mother tongue is not english, to be exposed to a soft and "easy to understand" english accent from their teachers, even more so than native english speaking children, who are less likely to pick up different accents from school and can understand more easily, say, an scottish accent or afrikan.

If a parent is paying (a very expensive!) fee for an English school, then a native, clearly spoken level of english is a basic expectation.

Sorry but I found your comment very wrong.