Hill has two legacies. The first was his model for education of the emerging middle classes. The second was his model for an efficient postal system to serve business and the public, including the postage stamp and the system of low and uniform postal rates, which is often taken for granted in the modern world. In this, he not only changed postal services around the world, but also made commerce more efficient and profitable, even though it took 30 years before the British Post Office's revenue recovered to its 1839 level. The Uniform Penny Post continued in the UK into the 20th century, and at one point, one penny (1d) paid for up to four ounces (113 g).