Since I am the author of this post, I thought I would make a contribution here.
The main thing I am referring to is the situation in London where there are chess teachers in schools, not school teachers who teach chess, but external chess teachers, who charge a ridiculous amount of money and do not even know the rules of the game! They have made up their own credentials which sound impressive and the schools are getting conned by this.
These people are also coaching privately and some charging Â£100 an hour for their services. I guess some parents have the belief that the more expensive it is, the better it is. As far as I am concerned, this is fraud - posing as a chess international or master and making money out of it.
I don't believe every chess master is good at teaching children and I don't think they do either. Some are really suited to teach the more advanced players, some not suited to teach at all. This isn't the problem here. It is the fact that non-chess players, non-teachers and people who actually don't have the skills for either are conning families.
It is frustrating as a teacher as when coaching children individually that have one of these teachers at school, you have to constantly undo their mistakes. You have to tell them that the king does not go on its own colour and that there is no rule that say six checks and it's a draw and whoever turns their rooks upside down first when sitting at the board can start with three queens. These are just the beginner mistakes I am talking about.
It goes up further... There are some "coaches" who are teaching stronger children (say, 130 grade) and are only about 60 grade themselves. Whilst I believe that they can be mentors etc and role models and help on a psychological level, at this level of chess, I do not think that the 130 grade would benefit too much from chess advice from a 60 grade (that doesn't even compete). I have heard: "Well my other coach said that the Sicilian is a bad opening because you should be playing e5", "The Dutch is bad cos it weakens the king", "All King n Pawn v King is a win, no matter what cos you can force the pawn to the end of the board".
Once children are young and impressionable, it is difficult to undo bad habits and unlearn things.
I have also had bad behaviour from coaches that is being taught. For example, one coach has taught his school that they can put their hand out at any time and say : "Checkmate" and if they shake it they win. Even when the position is not check. They should all do it when they are losing so they don't lose. Or, offer a draw and then pretend it was checkmate.
Things like that are unacceptable to teach children.
I think that behaviour like this needs to be nipped in the bud as soon as possible. Therefore I am happy for any school to contact me with details about their coach. Schools may not know where to find out this information, but I should be able to. I am sure that all of my team will help too. We just want the children to get the best education and this nonsense is not helping!