Some used to in the past, but I think that's not so common these days (since they're essentially sending you to be certified to teach in other schools). If an independent school is willing to hire you and treat you as a full teacher, I think it's more common these days for them to continue doing so without the relevant training.

(Implication - if you wish to change school later, you'll be limited to other independent schools.)

One exception might be if you do very well and they wish to get you appointed as a KP.