I think they may be one and the same, but not sure as I have not used Aerad for some time. BA use Navtech.
They are definitely looking at the No-Tech side of things. Know your profiles, you will be asked questions, and not only that the pitch power settings work. Show interest in the trainer and have your own questions prepared. The flying side of things is only a small part. Be timely but don't be rushed. BA use TDODAR as a decision making tool, I would use it to.
Radar was in and out. For mayday/pan we received radar vectors. For standard A to B expect holding and procedural approach. Approach may be non precision or ILS.