The British government paid out £20 million to compensate 3,000 slave-owning families for the loss of their "property" when slave ownership was abolished in Britain's colonies in 1833. At the time, that sum amounted to 40% of the UK's annual spending budget; today, one could calculate the total value of the 19th-century payouts to be around £16.5 billion (=USD $25 billion; the actual sum can vary, depending on how you calculate).

In The Independent, an article digging in to the data, which will be released this week in the form of a publicly accessible database.

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