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Financial instruments and risk management - Financial assets and liabilities measured at fair value (Details) - GBP (£) £ in Millions	Jun. 30, 2021	Jun. 30, 2020
Valuation techniques based on observable market input (Level 2)
Disclosure of detailed information about financial instruments [line items]
Derivative assets	£ 443	£ 758
Derivative liabilities	(129)	(145)
Financial assets/(liabilities) at fair value	314	613
Valuation techniques based on unobservable market input (Level 3)
Disclosure of detailed information about financial instruments [line items]
Financial assets - other	138	116
Financial liabilities - other	(578)	(416)
Financial assets/(liabilities) at fair value	£ (440)	£ (300)

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- Definition

Financial assets liabilities at fair value.

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- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

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