Another stark warning for Stormont over delays to welfare reform - is NI a special case?

"The idea that Northern Ireland can sit and refuse to make any changes round welfare reform is not a sustainable political position and it says to the people of Northern Ireland, politics doesn't work." That's what shadow Secretary of State Ivan Lewis told the Nolan show earlier this week. So another stark warning for local politicians. This time from the Labour party's main man in Northern Ireland.