We considered it a few years agao but decided against it.
We hoped to amalgamate all debts (hb o/p, CTAX and rent arrears) into one and then accept one payt from the debtor. The problem we encountered was how to then distribute that payment between the various debts. Rent arrears needed to be cleared quickly because they have an impact on er housing, CTAX arrears are a priority debt and that leaves HB overpayments bottom of the pile and critisism for a poor recovery rate.
In the end we decided that it wasn’t workable. However our revenues and benefits debts are recovered by the same team and they do try and be as joined up as possible when negotiating repayment ararngements.