I get you, thats not a problem, did you register your kid in the UK? if not
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I will confirm this but to be blunt to get the none O
Birth Cert
Copy of the schools licences
Copy of letter from the school stating he is in etc term info
Copy of his passports (thai and UK)
... sorry hit enter to early but just found this, seems spot on what I needed
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If your doing it in Hull and your from the UK you do not need to show any financial stuff at all.