Driven piles and precast concrete ground beams were chosen because of archaeology. The site used to be a mediaeval manor house. Archaeologists were given a limited period to explore the site and any remaining find had to be protected for future generations. This was achieved by laying a blanket of soft fill over the whole area then aiming the piling to minimise the damage to potential remains. Bored piles would have caused more damage as they are typically double the size and cast in situ piles would have been deeper.