Around £2.5 k but you will need to take around !5% off for IVA fees plus any other fees that may be due.
How long you wait depends on who you are with.
IVA started March 2011, Completed March 2016 and certificate issued 11 days after final payment. It was not always easy but then some of the best decisions aren't.
This is not an easy calculation to make without the full facts. It is effectively 8% per year but given that the balances decrease with every dividend payment then the amount is not exactly the same each year [unless no dividends were paid]. PPI would also reduce the balances and thus the interest so this would need factored in too.
Sorry folks but I misread the post. I thought the poster wanted to know how much statutory interest would need to be paid if the original debts were £37k.