In 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 and 1934, is his most well-known work. From the outset, it was designed on a large scale; it is still the longest, widest road tunnel in Great Britain. Mott was engineer for the works, in association with
J. A. Brodie, Engineer for the
City of Liverpool. His partnership (by then named
Mott, Hay and Anderson) designed and supervised the construction of the Mersey Tunnel in its entirety. In 1924, he was elected President of the
Institution of Civil Engineers. Mott's other post-
World War I works include the extension to
Morden of the
Northern line, the enlargement of the original
C&SLR tunnels from 10' 6" to 11' 8" (using a tunnelling shield which could be worked at night but through which trains could drive during the day), the
Jubilee Bridge and work on the
Tees Newport Bridge. In 1930, aged 71, he gave evidence to a British government inquiry on the engineering aspects of a proposed
Channel Tunnel (which was not built, though Mott, Hay and Anderson designed the bulk of the successful scheme for Channel Tunnel half a century later). In the same year he was created
baronet. In May 1932 he became a
Fellow of the Royal Society—a rare honour for a civil engineer. He died on 7 September 1938, in London. The baronetcy is currently held by his great-grandson, David Hugh Mott (born 1952). ==References==