About 18 years ago, we wanted to find out if a divorce had taken place and applied to a High Court in High Holborn??? , London irrc to check their records. It cost a fee about £20 iirc for a 5 year search.
Think I may have destroyed the reply as no divorce was found.
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Just googled and found this - price is £65 for 10 year search.
https://www.gov.uk/copy-decree-absolute-final-order