I have been watching this plot in Ham Street for some months waiting for the new building to appear and it has been interesting to see the ground being prepared for this. The most recent development brought this most impressive machine to the site.
Clearly it is a drill and it is creating the deep holes required to keep the new building steady on its feet. I do not know the geology of the site but the gravel pits were close by so it is likely that the ground is not very solid. The previous house there was only a bungalow, like its neighbour, possibly for that reason.