As the tracker people were there recently, I suspect that they will be discussing issues more generally such as mortgage rates and dual pricing in insurance.
I hope they ask him about stuff that is not consumer-related. For example:
Authorisation and supervision of financial firms post-Brexit
Economic outlook
Health of banks' balance sheets
You can read transcripts of Committee hearings from 2006 where the Regulator was obsessed with consumer issues which in hindsight were trivial compared to the financial stability risks that were being ignored.