@TempleHill
I was astonished to hear one of them is only qualified to teach primary but she is teaching in secondary because there is no regulation on the private sector.
The vast majority of state schools are also able to recruit non qualified teachers. In addition to this, the state system has an increasing problem with "qualified" teachers teaching subjects which they have no experience of. A PE or geography teacher may be "qualified" but may not be the best person to be teaching maths for example.
In reality, most private school teachers are not only qualified but they are also subject specialists. Every teacher my children have had has been qualified. Every teacher at secondary has been a subject specialist, with subject specific qualifications and often with real life experience of their subject outside teaching.
I cannot understand why people keep going on about sub-standard teaching in the private sector. Parents would be quick to move if this were true. If some people think that private schools are no better, fine. No one is forcing anyone to use them.