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Accounting information and policies - Principal foreign exchange rates used in translation of financial statements (Details)
 12 Months Ended
Jun. 30, 2023
€ / £
$ / £
Jun. 30, 2022
$ / £
€ / £
Jun. 30, 2021
€ / £
$ / £
US dollar      
Foreign exchange rates [abstract]      
Income statement and cash flows | $ / £ 1.20 1.33 1.35
Assets and liabilities | $ / £ 1.26 1.21 1.39
Euro      
Foreign exchange rates [abstract]      
Income statement and cash flows | € / £ 1.15 1.18 1.13
Assets and liabilities | € / £ 1.17 1.16 1.17