The original price for the engineering works conducted by BAM Nuttall had been £88 million, and estimates in mid-February 2010 projected costs to have increased to £120 to 140 million. The main issue was structural repairs necessary to the new Great Ouse Viaduct to prevent water ingress. Later that month, Cambridgeshire County Council stated that the council was due to borrow £41 million during 2010 and then £10.2 million the year after, payable to BAM Nuttall in order to complete the project.