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'Post-stage rates' for letters carried on the post-roads out of London were introduced in 1635 with the establishment of a state run postal service for the public's letters. The rate was based, primarily, on mileage and on the number of sheets the letter comprised of, heavier letters were charged by weight. Later, Penny Posts were set up for the collection and delivery of local letters, based on cities and other major centres beginning in London in 1680 and later extended to other provincial centres. Postage on general mails was normally paid by the recipient upon delivery.

Acts of Parliament, and later Treasury Warrants, gave authority for changes in rates and laid down charges for new services as they were introduced. The most significant was the Act of 1839, which led to the introduction of Rowland Hill's scheme for a Uniform Penny Postage in 1840. Postage rates were now based on weight and prepayable by means of the newly introduced stamped stationery and the more popular adhesive postage labels (postage stamps). The Postal Reform of 1840 also removed from Peers and ordinary Members of Parliament their privilege of franking letters for free transmission through the post.

The formation of the Universal Postal Union in 1874 led to uniformity of postage rates for overseas mail. Penny Postage within the Empire began on Christmas Day 1898. Two-tier postage, based on speed and offering the choice of a higher first-class rate to give fast delivery or a second-class rate for slower service, was introduced on 16 September 1968.