The tripods were placed over the nails that had been hammered into the tarmac when the topographical survey had been carried out. This alone was no mean feat since the survey was carried out two years ago and so lots of soil and grass had built up on the kerbs since then.
The tarmac was tenderly brushed and scraped (with car keys and a convenient bit of damaged guttering from the old site) and eventually the nails became visible, hooray! We would have had to redo the survey otherwise!
Looking round the floorplan of the house it looks small but apparently this is quite normal for this stage.
I've heard that a digger may be returning soon....