How often do migrants successfully fight their removal from Britain on the basis of their human rights?
The clamour from the right for the UK to withdraw from the European Convention on Human Rights has been growing - even some high-profile Labour figures say it needs reform.
So, I've come to an immigration appeal court - unannounced - to find out how it is used by migrants and their lawyers here.
Decisions delayed, outcomes unpublished
I get to the fourth floor of a large court building in Birmingham .
The first case I'm ushered into to see is a 38-year-old Nigerian man. He came on a student visa - but that ran out.
Just before he did, he put in a claim to stay on the basis of his relationship with a woman, who is originally from Barbados but has lived and worked in Brit