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Post employment benefits - Narrative (Details) € in Millions, £ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 GBP (£) | Jun. 30, 2022 GBP (£) | Jun. 30, 2022 EUR (€) | Jun. 30, 2021 GBP (£) | Jun. 30, 2020 GBP (£) | Dec. 31, 2030 GBP (£) | Dec. 31, 2027 GBP (£) | Dec. 31, 2027 EUR (€) | Jun. 30, 2022 EUR (€)
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Defined contribution plans |  | £ 33 |  | £ 25 | £ 24 |  |  |  |
Cash contributions to plans on next year | £ 70 |  |  |  |  |  |  |  |
Inventories |  | 7,094 |  | 6,045 |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Distribution from the profits of the partnership |  | £ 0 |  | £ 0 |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, interest rate |  | 88.00% |  | 86.00% |  |  |  |  | 88.00%
Hedging instrument, inflation rate |  | 90.00% |  | 90.00% |  |  |  |  | 90.00%
Percentage of UK plans of total plan liabilities |  | 68.00% |  |  |  |  |  |  | 68.00%
Inventories |  | £ 561 |  | £ 564 |  |  |  |  |
United Kingdom | Contingent liability arising from post-employment benefit obligations | Maximum |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Cash contributions to plans on next year |  |  |  |  |  | £ 430 |  |  |
Ireland |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Hedging instrument, interest rate |  | 70.00% |  | 62.00% |  |  |  |  | 70.00%
Hedging instrument, inflation rate |  | 76.00% |  | 76.00% |  |  |  |  | 76.00%
Group's contribution to the plan |  | £ 20 | € 23 |  |  |  |  |  |
Ireland | Maximum |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Contingent asset granted |  | £ 172 |  |  |  |  |  |  | € 200
Ireland | Contingent liability arising from post-employment benefit obligations | Maximum |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |
Cash contributions to plans on next year |  |  |  |  |  |  | £ 91 | € 106 |

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