I'd love to know the return on investment here.

Hundreds of thousands of pounds spent on paint, vinyls, consultants, time spent in meetings, fuel to get to and from outsourced bodyshops and coachworks, labour, contractors etc

Vs what sort of return?
What sort of tangible evidence can prove any increase is because of a paint job or down to external factors relating to the weather, economy or events organised by 3rd parties?