A cost range was used due to the complexities associated with a project of this scale in a constrained urban environment, with varying ground conditions and site constraints, including the presence of a plethora of public utilities as well as the Glasgow subway underground tunnels.The original estimate of £33.4 million in April 2021 for the propping works, was calculated without the benefit of any design or investigations having yet been undertaken due to the emergency nature of the works, and was based on the limited information available at the time. S6W...