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Revenue and segmental reporting, Deferred revenue (Details) - GBP (£) £ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue and segmental reporting [Abstract]
Revenue recognised related to performance obligations	£ 0	£ 0	£ 0
Deferred revenue [Abstract]
Current deferred revenue (Note 23)	27,118	28,457
Non-current deferred revenue (Note 19)	24,868	47,961
Total deferred revenue	51,986	76,418
Deferred revenue held, included in current deferred revenue	£ 7,361	£ 3,132

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The amount of liability representing income that has been received but is not yet earned. [Refer: Revenue]

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The amount of deferred income classified as current. [Refer: Deferred income]

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The amount of deferred income classified as non-current. [Refer: Deferred income]

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The amount of regulatory deferral account credit balances that the entity does not separately disclose in the same statement or note. [Refer: Regulatory deferral account credit balances]

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The amount of revenue recognized related to performance obligations.

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