Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from adjustments for the current tax of prior periods. [Refer: Average effective tax rate; Applicable tax rate; Adjustments for current tax of prior periods]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 12
-IssueDate 2023-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_TaxRateEffectOfAdjustmentsForCurrentTaxOfPriorPeriods
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Taxation (Details) - GBP (£) £ in Millions		12 Months Ended
Taxation (Details) - GBP (£) £ in Millions	Apr. 01, 2023	Dec. 31, 2022	Dec. 31, 2021
Taxation (Details) [Line Items]
Unutilized tax losses		£ 554.1	£ 488.3
Bottom of range [member]
Taxation (Details) [Line Items]
Corporation tax rate	19.00%
Top of range [member]
Taxation (Details) [Line Items]
Corporation tax rate	25.00%