Sir Basil Mott, 1st Baronet, FRS (16 September 1859 – 7 September 1938) was one of the most notable English civil engineers of the late 19th and early 20th centuries. He was responsible for some of the most innovative work on tunnels and bridges in the United Kingdom in the 40-year period centred on World War I. Early career Basil Mott was born in Leicester on 16 September 1859. He was educated at the International School, Switzerland and at the Royal School of Mines where he won the Murchison medal in 1879. He was first employed as a mining engineer with the Neston Colliery Co. in Cheshire but in 1886 was invited by J H Greathead to join the staff of the City & South London Railway (C&SLR), for which Greathead was Engineer. His work on the C&SLR gave him a taste for underground construction works that influenced the remaining 40 years of his professional life. He did well at the C&SLR and was promoted, first to resident engineer (RE) for the extension of the C&SLR from Stockwell to Clapham, then to RE for the entire line. After the railway opened in 1890, he was retained as Engineer by the operating company: this gave him the opportunity to develop techniques for carrying out reconstruction works during overnight possessions of the tunnels, techniques which are still used on LU today. Shortly after Greathead's death in October 1896, Benjamin Baker formed a partnership with Mott for the design of the Central London Railway. Their association continued with the extensions and rebuilding on the C&SLR (including the underpinning of St Mary Woolnoth church at Bank) and the widening of Blackfriars Bridge. They worked from the same offices until Baker's death in 1907. Mott, Hay and Anderson 1n 1902, Mott formed what turned out to be a lifelong partnership with another protégé of Baker's, David Hay. Subsequently, the partnership of Mott and Hay (now Mott MacDonald) worked on extending the Central London Railway, the building of escalators in London Underground and the construction of the Tyne and Southwark Bridges. It also designed the underpinning required to stabilise Clifford's Tower in York. During the first world war, Basil Mott visited France and India, advising the government on solving engineering problems. He was created a Companion of the Bath (CB) in 1918 in recognition of these services. The Mersey Tunnel, which he worked on between 1922