You hope !!
The last I heard it was up to individual test centres as to how they wanted to play this module 4 - some saying it will be with the practical on-road drive and others saying that they will do all mod 4s on a specific day and bring in someone to do them - I don’t think they know how this is going to work yet on a practical level.
I KNOW! There’s certain benefits to owning the test centre. What others do is for them to sort out - but I think it will be on similar lines 