"I've just had an operation, but nothing too serious"

In this quote, Syd Barrett is most likely describing a recent medical treatment he went through. He assures the reader that it was not a severe operation, indicating that it was a small or routine procedure. This might suggest that he is downplaying the significance of the operation, perhaps to prevent triggering issue or concern. It might likewise suggest that he is trying to keep a favorable mindset and not let the operation impact him too much. In general, the quote communicates a sense of nonchalance and a desire to move on from the experience.