[Billy can't help letting out an amused snort at how aggressive Mr. Pink is towards him.]

What, lookin' to pick a fight, you cheeky blighter? I'll send you sailin' like a football if you push it!

[He doesn't sound serious about it. At learning the blend, Billy considers for a moment before nodding to himself.]

Well, ain't about to turn down fresh tea if you're offerin', lass.

[This is not an indication of any trust though--he just isn't clocking her as a threat at the moment, obviously.]