The Ford thesis argued that there was a short‐term causal relationship between British overseas investment and British merchandise exports in the late nineteenth century. However, economic historians since Ford have found little empirical evidence in support of this argument. Using data on bilateral British lending, this article finds that such a relationship did exist, with British ex ante lending preceding merchandise exports by 2 years. A case study of New Zealand, which had an extraordinarily high share of Britain in its imports, reveals that the relationship was conditional upon the lending being allocated to social overhead capital.