Indirectly related, but be aware of this: https://www.fca.org.uk/publication/multi-firm-reviews/our-work-on-motor-finance-final-findings.pdf (gory details), https://www.fca.org.uk/news/press-releases/fca-acts-protect-those-buying-motor-finance (summary) and also your requirements under CONC (full details here https://www.handbook.fca.org.uk/handbook/CONC.pdf)
For sure, there is going to be increased public awareness of motor finance and I suspect a lot of high-end dealers and car supermarkets making a number of changes. Basically, don't look at making extra money on finance at the expense of the customer!