No - sorry - that still shows that you don't know what third-party certification is.Yes, sorry ban, to be a bit clearer I will be using a third-party certifier to meet the needs of Part P where I have not used a registered electrician to do the installation. My phrasing isn't great. My building inspector has told me that all they will need at the end is the EICR or similar.
It is not "doing every single circuit now and getting a local company to provide test and inspection via an EICR".
If you are supposed to be using a third-party certifier, then you have to appoint them before you start the work, and you need to be liaising with them over every question you have about how do do the work.