This happened to me a couple of years ago, i had informed the TOC of my pass, and got invited to an assessment day. The TOC didnt get back to me so i thought id try my luck and phone the OPC! I explained the situation, the guy on the phone took my NI number and the name of the TOC I was booked in with, said I had met their standards and i needn't attend the assessment center and he would also advice the TOC.
I got an email the following day from the TOC advising i needn't attend and was put through to the next stage. I was shocked the OPC even told me given some of the experiences on here