don't worry about your English a bit!
I don't know much about linguistics at all, and before this year I couldn't have even told you what it is! I've never taken a course in anything remotely similar. Anyway, your topic seems very interesting and pertinent in a world the loves throwing around information so much!
here is information I can offer you, and perhaps you can find something about it:
I've read The Liar, The Hippopotamus, Moab is my Washpot, Making History, and a few dozen essays in Paperweight by Stephen Fry. I have not yet read The Stars' Tennis Balls, unfortunately.
I think most interesting aspect of his writing is the word choice. Fry often uses words that I need to look up in a dictionary, and I am a native English speaker (albeit one from the United States.) In both The Hippopotamus and Making History, when the characters are by a body of water in the woods, he uses the words "pong" and "midges" to create the setting, and I wasn't previously familiar with those terms. I also noticed an affection for the word "footling" which shows up in both The Liar and The Hippopotamus. I've never seen it anywhere else before, and no one I've asked (because I do care about these things) seems to know the definition.
His character Professor Trefusis, who appears in The Liar, and who "wrote" many of the essays in Paperweight, likes to speak very obtusely, using very vibrant language and metaphors to do so. Trefusis says things like "Of all the solecisms, gaffes, floaters, blunders, and bowel-shatterlingly frightful bloomers possible to make, I am fully persuaded that overdressing heads the field by a comfortable furlong." What's interesting to me about that sentence that he has so much fun listing words that are essentially synonyms; it would be really difficult to to differentiate a gaffe from a floater. Actually, I didn't know what a floater was, and I had to look it up to see that it meant a mistake. According to the website I found, It's old British slang, and how I was I supposed to know that? I still liked the sentence though! Then, Trefusis doesn't just think something he's fully persuaded (by himself, I guess) that overdressing is bad and uses some sort of racing metaphor to express just how bad it is. I personally enjoy this convoluted method of expression.
anyway, that all may have been entirely useless, but if even one point in there helps, then it wasn't a waste of time. If I need to be clearer anywhere, don't hesitate to ask.
I hope writing your thesis will be interesting and relatively painless!
edit: I was feeling really weird about analyzing a sentence so deeply...I just wanted to try to help.