Champagne first appears in Kingsman: The Golden Circle when he greets Eggsy Unwin and Merlin and demonstrates his skill as an agent by throwing his hat across the room right onto the top of a oversized champagne bottle with his back turned. He proceeds to apologize sincerely for all misunderstandings between the Statesmen and the Kingsman that had happened thus far, and offers them any support he can give. He samples whiskey throughout the encounter.
He's deeply concerned about agent Tequila's well-being when the latter is affected by Poppy's tainted drugs, and immediately dispatches all available Statesman agents to track down the cure in the interest of his agents and the world, despite contradicting the President. His other interactions with the rest of his team show that his devotion to them is just as strong. He's constantly taking a sniff or a swish of bourbon while discussing important strategies with the Statesman and the Kingsman. He doesn't actually swallow anything, however, and keeps a spittoon by his chair.