The right to make a complaint for the mis-sale of any PPI policies that were sold prior to bankruptcy is considered to be an asset of the bankruptcy estate.
As such, any redress that becomes due belongs to the OR because, technically, the claim was not yours to make. Whether or not you have been discharged is irrelevant
Unfortunately, this means that you will almost certainly not be able to keep any of the redress.
You are not really supposed to proceed with complaints about PPI where the sale took place prior to bankruptcy without permission from the OR so you may want to tread carefully and you may need to tell them.
There is a government guidance document on it here (or there is if you add the appropriate internet prefix as I can't post links!);
Citizens Advice also have one;
I'm assuming you haven't and if you have it may be too late
but DO NOT USE A CMC for any complaints involving bankruptcy,
IVA or where you have defaulted on a debt.
This is because you may not actually receive any of the redress that becomes due as it may not belong to you or may be used to offset.
You would then have to find some way to pay the CMC out of your own pocket.