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In page Sovereign immunity:
"The position was drastically altered by the Crown Proceedings Act 1947 which made the Crown (when acting as the government) liable as of right in proceedings where it was previously only liable by virtue of a grant of a fiat.[2] With limited exceptions, this had the effect of allowing proceedings for tort and contract to be brought against the Crown.[2] Proceedings to bring writs of mandamus and prohibition were always available against ministers, because their actions derive from the royal prerogative.[citation needed]