I really do feel for you, I am just keeping my head down at the moment but our OR is hell-bent on getting his IPA of £100 per month, even though he has got our surplus income at about £85 at the moment!
There is no way we will sign an IPA so it will have to go to court if he wants to pursue it! We have not heard anything for a while, I just dread the post every day! We just feel sometimes that we are being unfairly treated , there is another issue with some transactions on our bank account he is not at all happy with, (we had a lot of expenses recently but it was not credit we spent, it was our wages for essential items) so I would not be too surprised if a BRU/O will come our way!
But so be it, we took the drastic step of going bankrupt to get away from these overwhelming debts, yes, it is our mess and I accept responsibility for them but we expected to at least be allowed a decent standard of living or we will be back to square one again if he gets his IPA as we will not have enough to live on!
If I were you I would write again, saying you are not happy with signing the form and the reasons why and let them take it to court.