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Financial instruments and risk management - Schedule of notional amounts, contractual maturities and rates of hedging instruments designated in hedging relationships by main risk categories (Details) £ in Millions | Jun. 30, 2023 GBP (£) $ / bushel USD_per_Metric_Tonnes | Jun. 30, 2022 GBP (£) poundSterlingPerTherm USD_per_Metric_Tonnes
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Net investment hedges | Foreign exchange risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 637 | £ 11
Net investment hedges | Foreign exchange risk | US dollar |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.27 |
Net investment hedges | Foreign exchange risk | Turkish lira |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 22.27
Cash flow hedges | Foreign currency debt risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 873 | £ 1,694
Cash flow hedges | Foreign currency debt risk | US dollar | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.60 | 1.22
Cash flow hedges | Foreign currency debt risk | US dollar | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.88 | 1.88
Cash flow hedges | Foreign currency exchange risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 1,734 | £ 1,874
Cash flow hedges | Foreign currency exchange risk | US dollar | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.05 | 1.22
Cash flow hedges | Foreign currency exchange risk | US dollar | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 1.33 | 1.42
Cash flow hedges | Foreign currency exchange risk | Mexican peso | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 14.76 |
Cash flow hedges | Foreign currency exchange risk | Mexican peso | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 18.38 |
Cash flow hedges | Foreign currency exchange risk | Euro | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.13
Cash flow hedges | Foreign currency exchange risk | Euro | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates |  | 1.17
Cash flow hedges | Commodity price risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 217 | £ 234
Cash flow hedges | Commodity price risk | Minimum | Natural Gas |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | poundSterlingPerTherm |  | 1.67
Cash flow hedges | Commodity price risk | Minimum | Aluminium |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | USD_per_Metric_Tonnes | 2,248 | 2,009
Cash flow hedges | Commodity price risk | Minimum | Feed Wheat |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | $ / bushel | 183.75 |
Cash flow hedges | Commodity price risk | Maximum | Natural Gas |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | poundSterlingPerTherm |  | 3.57
Cash flow hedges | Commodity price risk | Maximum | Aluminium |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | USD_per_Metric_Tonnes | 3,399 | 3,399
Cash flow hedges | Commodity price risk | Maximum | Feed Wheat |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | $ / bushel | 240.00 |
Fair value hedges | Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 3,999 | £ 4,444
Fair value hedges | Interest rate risk | Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | (0.0001) | (0.0001)
Fair value hedges | Interest rate risk | Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Range of hedged rates | 0.0309 | 0.0309

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