Not all immigration decisions have the right of appeal in the UK.

There is currently only the right of appeal within the UK if the Home Office refuse an application based on: an “international protection” claim (asylum or Humanitarian Protection applications); a decision to revoke refugee status or humanitarian protection; a decision that you have no right to remain under European law; or a human rights claim.

And not all applications based on human rights or protection grounds have a right of appeal in the UK.