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Thanks for your question.
If you are apply for an ancestry visa from within the UK then they will only entertain the applcation if you entered the UK holding an entry clearance based on your UK ancestry OR they had already given you permission to stay based on your UK ancestry. As you have already entered the UK in a different immigration category the application would not be entertained.
Additionally, you can only apply if you have a grandparent who was born in the UK.
You really are much better off focusing on your appeal and getting a solicitor or counsel to act on your behalf.
Sorry it could not be better news.
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