I have lived in the UK for 20 years continously but was in prison for 4 months as a result of a criminal conviction. Can I apply for leave to remain on the basis of 20 years long residence?
Your application for 20 years long residence may not succeed becuase as a result of prison sentence, the continuity of 20 years long residence is broken.
What application form is used to submit initial application for leave to remain on the basis of 20 years long residence?
You should complete application form FLR (FP) online for your initial application for leave to remain on the basis of 20 years long residence.
Do I need to meet the English language requirement for my initial application for leave to remain on the basis of 20 years long residence?
No, you do not need to meet the English language requirement for your initial application for leave to remain on the basis of 20 years long residence.
Will I get right of appeal if my application for leave to remain on the basis of 20 years long residence is refused by the Home Office UKVI?
You should get an in-country right of appeal against the refusal of your initial application for leave to remain on the basis of 20 years long residence unless the Home Office UKVI certify your human rights claim to be manifestly unfounded.