Sorry didnt really make that very clear.
If you have an EIC with full set of test results then all you need do is to fill out a PIR and give them that.
If you have installed a new CU then a full EIC will be required anyway.
If you have installed new circuits or done any major changes that required an EIC for those circuits, then those results can be transferred over to your PIR.
You will then need to test and inspect the rest of the install.
If the council request a PIR then you need to give them one.
All an EIC does is confirm that you have done work in accordance with BS7671.
A PIR is a report on the condition of the installation. Two different things.
Hope thats clear(er)!