The Met's chairman and three other directors were on the board of the District, John Fowler was the engineer of both companies and the construction works for all of the extensions were let as a single contract.
Formanden for Met og tre andre bestyrelsesmedlemmer var også i District-bestyrelsen, John Fowler var ingeniør for begge selskaber, og anlægsarbejderne for alle forlængelserne blev udbudt som en enkelt entreprise.