Birbalsingh didn't live in the UK until she was 17, so she didn't go to British schools until she was in the sixth form. I have the impression that she's trying to provide underprivileged children with a "traditional" private/grammar school education (or at least what she imagines traditional to be). Ironically (because people have accused me of criticising her), I applaud her for her aims because I think it's misguided to make excuses for underprivileged children, many of whom can achieve as well as anybody else.
I did go to a traditional, academic direct grant grammar school and I honestly can't remember what we had to eat on Fridays. The only thing I can remember about the food was that we ate a lot of gloopy stews with lumpy mashed potatoes and prunes. I'd rather eat vegetarian food any day. We didn't sing the national anthem either.
However, I think her own interpretation of traditional education is misguided, maybe because she hasn't experienced it. When I was a teacher, I was known as a bit of a dragon and it used to be extremely frustrating when poor behaviour wasn't followed up by senior management, so I'm happy she realises that good behaviour is a precursor to effective learning.
Nevertheless, I find it intensely irritating that Birbalsingh is forever boasting that her school is exceptional. It really isn't. There are other schools with exemplary discipline - and this current issue shows that it's not quite so perfect as she claims. I don't knock the pupils' attainment, but she does "game" the system. The government only looks at 8 GCSEs when it issues its statistics. I can't remember the exact formula, but English and Maths count for more than other subjects, so at Michaela pupils are taught these two subjects for double the time most other schools do. The choice of subjects is restricted, There is no IT, Design and Technology or Drama. Music is only taught for the first two years (no GCSE), only one foreign language is offered, pupils can't take GCSEs in Geograpy and History and they can't take three Science GCSEs. They take a maximum of 8 GCSEs (the ones which count in the league table). Maybe that's fine for the majority of pupils and there are certainly people who support that kind of "back to basics" curriculum. However, it doesn't challenge the most able, who are perfectly capable of achieving top grades in 11 or 12 GCSEs, nor does it offer a foundation for pupils who might want to take practical, vocational courses post 16, which many GN posters advocate.
Finally, I actually met Birbalsingh many years ago. She's extremely energetic and charismatic. She was a French teacher and I've seen videos of her in the classroom and there's no doubt she was inspirational.