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Revenue and segmental reporting, Trade receivables, contract assets and contract liabilities (Details) - GBP (£) £ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Receivables from contracts with customers [abstract]
Additions	£ 453	£ 897
Trade Receivables [Member]
Receivables from contracts with customers [abstract]
Beginning balance	1,186	3,600
Additions	4,023	3,431
Deductions	(5,209)	(5,845)
Ending balance	0	1,186
Contract Assets [Member]
Receivables from contracts with customers [abstract]
Beginning balance	424	0
Additions	1,658	424
Deductions	0	0
Ending balance	2,082	424
Deferred Revenue [Member]
Receivables from contracts with customers [abstract]
Beginning balance	76,418	98,232
Additions	0	0
Deductions	(24,432)	(21,814)
Ending balance	51,986	76,418
Contract Liabilities [Member]
Receivables from contracts with customers [abstract]
Beginning balance	76,418	98,232
Additions	0	0
Deductions	(24,432)	(21,814)
Ending balance	£ 51,986	£ 76,418

X

- Definition

The amount of additions to right-of-use assets. [Refer: Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph h
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-URIDate 2020-01-01

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X

- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer that is unconditional. A right to consideration is unconditional if only the passage of time is required before payment of that consideration is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

The amount of deduction to right-of-use assets. [Refer: Right-of-use assets]

+ References

No definition available.

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