Hi Murphy
Your question is difficult to understand. I am guessing what your question is and I have edited the title accordingly.
What does the word "(specialised)" mean? Are you asking
"How were mortgage brokers who specialised in sub-prime mortgages paid?"
If that is your question, then I would say that they were paid the same way as any other broker - usually by commission from the lender. However, some charged their customers fees as well.
Are you asking if your mortgage broker had indemnity insurance? I don't know, but I would guess that the Central Bank makes it a requirement of authorisation.
You should probably provide further information as I think it would be difficult to prove professional negligence against a mortgage broker.
Brendan