I saw this trial in action on an Open Day last autumn at U of Birmingham, though in the Chemistry Dept and for 2023 entry; as Chemistry does not feature on the list for 2024 entry, it suggests it is something that individual departments try out and run with or not according to experience.
I think an interesting feature is that it is only available to those who book to attend an Open Day and you get a brief 1-2-1 meeting with an academic in the department, presumably responsible for admissions (at the Chem Open Day it was in a separate, slightly more private area and appeared to be choreographed well).
At the very least, it gives an opportunity for prospective students to have an in depth discussion based on their GCSE results, current A level performance and aspirations in terms of uni study in the particular subject area.
I would imagine for staff it is extra work at an Open Day but perhaps also an opportunity to get an up-to-date 'window' into what potential applicants are thinking about as they journey through the UCAS process.
At Open Days my DC say they have always found staff approachable and informative but that sometimes conversations are a bit high level and that is understandable if academics don't want to probe unduly and potential applicants are hesitant to engage. The 1-2-1 idea helps set the expectation of a tailored conversation on both sides.
So, OP, if your DD is thinking about U of Birmingham, it is definitely worth booking a session on the Open Day; my view is more info often helps make for a more informed decision.