"We can fine companies 10% of their turnover for a breach of licence or legal duty".
https://www.ofwat.gov.uk/regulated-c...ns-and-powers/
Regulators of other industries say similar things, so I presumed the same was true of all regulators.
A quick Goggle suggests 4% or 20mil, whichever is higher.... but worth noting that if the prosecution goes to court, the court can issue it's own fine, which is limited to "Whatever the hell we like" and why our industry is now seeing record levels of penalty.