Children often follow their own heads and at least what you describe indicates that he has very good control and function of both his bladder and bowel. The important thing is not to force him but to encourage him and if you are certain that he has contol (like it seems) to then remove the option of a nappy during the day (even if he asks for it). One needs to be innovative and sensitive but firm (you still have lots of time to sort it out before next year).
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