According to the business FAQ, holding companies are specifically disallowed. I’m not sure whether this is banking license issue or a business decision, but if it’s the latter, I’d encourage this to be reconsidered.
Revolut is ideal for a holding company, that may carry active balances in many different currencies. Many holding companies also offer active management services to their subsidiaries and incur expenses, so all the regular card facilities would continue to be useful.
It could also encourage companies to hold multiple business accounts, for each of their operating companies. That’s then £25 - £1,000/month from every business, not just the directly trading company.
I, for one, would find this very useful.