My ex's lawyers filed those documents 10 days late. My barrister asked the judge not to admit them into evidence and for my case to proceed undefended. The judge said he would not do that, but he would give us an adjournment of the final hearing if I felt I was prejudiced by the late filing.
Of course I didn't want to delay the final hearing, and the judge knew that. So, nothing happened (although FWIW they looked bad for having filed late, when I had filed on time even though I was self-repping).