I went down to Singleton Park two days ago with my big lens, to see if the Dipper was still on the stream. It was; and, although the weather was very dull, I was able to get a few reasonable shots:
I went down again at lunchtime today, and there was the Dipper again in its usual spot. It then proceeded to disappear into thin air, and no amount of searching the length of the stream could relocate it. Guess it must have returned to wherever it came from.