The UK arm of an international brand
The segment that cuts across every line above and appears in none of them. The parent company is registered abroad, the marketing lead sits in a UK office or with a distributor, and the budget for this market is decided here. No public register separates these companies out, which is precisely why nobody works the segment properly.
Who signs: UK marketing director, country or general manager, regional brand lead, and the agency lead at the parent when the brief is global.