P11 is not FPS report. P11 is usually produced for each employee whereas FPS is shows total payments and deductions for all employees.Although I am a bit stuck here - Are P11s and payment summaries the same as RTI FPS reports? I requested FPS reports from my accountant and he doesn't know what that is and I was sent FPS receipts by HMRC and payment summaries from the accountant's payroll system.
FPS is a summary report, produced by the payroll software showing what has been submitted to HMRC via RTI.
P11 or deduction working sheet is a different report, showing all the remuneration, tax and NI deductions for each employee.
HO particularly wants to see your FPS reports which show that you are reporting via RTI.