You really shouldn’t have!
You’re too kind!
Cheers
Much appreciated!
Ta very much
That’s such a nice present-you really shouldn’t have!
You’re too kind!
You’ve bought me lunch-oh, you’re too kind!
Cheers
Cheers for that-it’s really helpful!
Much appreciated!
Your work here is much appreciated.
Ta very much
You made me tea? Ta very much!
A: "Here are the documents you asked for, Mr. Lubbock." B: "Ta very much, Sarah."