if I enter a debt management scheme, can i getthe money i owe on HP reduced?

No, money outstanding on HP is in effect secured against the item you took the HP out against. If you default in the HP payments, the HP company can repossess the goods and sell them to recover the money you owe. Any surplus from the sale will be paid back to you (less changes!) and any shortfall will be charged back to you. If you have a shortfall, your debt manager can negotiate to get that reduced along with your other creditors.

Broker Boy