Change law on computer evidence to stop repeat of Horizon miscarriage of justice

Innocent people were convicted of criminal offences such as theft and fraud, partly because they could not challenge the reliability of the Post Office's Horizon software system. This was due to legislation from 1999 stating that computer evidence is considered to be reliable unless proven otherwise.

Although the Post Office knew about multiple bugs in their system, they did not disclose this information to defence lawyers. The victims of miscarriage of justice had no way of challenging the reliability of the system, and in many cases their lives were ruined as a result.

There is more information about the legal position in this newspaper article from the Guardian. The article argues that this law seems to reverse the burden of proof normally applied in criminal cases. I passionately feel it should be changed to avoid injustice.

If you are a British citizen or UK resident, please sign and share my petition on, which asks for a “legally binding duty to disclose any known defects” in computer systems which produce evidence for use in criminal trials:

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Tarot decks shipping from UK

UK flag - image from Wikipedia Decks in stock on Etsy — shipping from UK in 1-3 business days

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Availability and prices correct as of 30 October 2022.

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These 78-card, fully illustrated decks are printed on demand by After a recent price rise by the GameCrafter, I have tried to make sure the prices shown on this website are correct. It is not clear to me why two decks of the same size are not always the same price (perhaps some decks use more ink than others???). To the best of my knowledge, the quoted prices are correct. (Last checked August 2023.)

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Latest updates: 18th February 2024: Uploaded remaining artwork completed in 2023 (up to Knight of Cups)

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