Legend: "Want to buy a snowboard?"
Kipper: "sure, how much mate?"
Legend: "£300?"
Kipper: "Awesome"
Legend: "ahh only cost me £200, done you like a kipper!"
Kipper: "Where does that saying come from anyway?"
Legend: "From me when I sold you a snowboard!"
Done up/stiched up like a kipper, surely takes it's meaning from the term red herring, which means to mislead or distract from an important issue, in a trickster style.
A Red Herring, in the literal sense, is a particularly strong smelling fish called a Kipper that has turned a red colour following the smoking process traditionally used to preserve it.
Therefore, to be done or stiched up like a kipper, clearly means to be duped or tricked by false information that was there for all to see, (in hindsight).
For example: when someone purchases an item they believe to be far superior to what it turns out to be, based on the persuasion and false information by the seller.
He was done up like a kipper when he bought that car. Meaning the car was a pile of s*** and he was tricked when he payed top dollar for it.
a job well done, to be pleased with a job you've just done. Dierived from "jobs a good'un", into "jobs a gudgeon" (which is a type of fish), into "jobs a fish" and finally into "jobs a kipper" (being a particurly smelly fish).
John; "you finished changing that wheel yet?"
Mike; "oh yes, 'jobs a kipper' "