Willow Warbler?

It looks like a Willow Warbler to me, and I can't think what else it can be, but it wasn't behaving like any Willow Warbler I've ever seen.  It was about 300m - 400m away from the nearest trees/bushes, and making its way along the path, flitting up into the weeds and then back down onto the path.  I followed it for quite some distance.

  • We have been watching a Willow Warbler doing similar antics this afternoon on a local reserve. I was flitting in front of us along the path and jumping up to the vegetation and down again. When we looked at the vegetation there were a number of small caterpillars under the leaves so we decided that the bird was feeding on them. Further down the path both a Blackbird and Song Thrush were feeding on Toadlets that were hopping over the path. It must have been the day for different diets for the birds
  • Thank you both.

    (I do wish birds would read the bird books and behave as they're supposed to, not go around baffling the easily-confused!)