 Whilst sitting in Guildhall, Lord Mansfield created,
a body of substantive commercial law, logical, just, modern in character and at the same time in harmony with the principles of the common law.It was due to Lord Mansfield's genius that the harmonisation of commercial custom and the common law was carried out with an almost complete understanding of the requirements of the commercial community, and the fundamental principles of the old law and that that marriage of idea proved acceptable to both merchants and lawyers.