Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 932
-SubTopic 235
-Name Accounting Standards Codification
-Section 55
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482245/932-235-55-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-SubTopic 235
-Topic 932
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482274/932-235-50-33

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Subparagraph (a)
-SubTopic 235
-Topic 932
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482274/932-235-50-31

Name:	srt_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Discontinued Operations (Details) - GBP (£) £ in Millions		1 Months Ended
Discontinued Operations (Details) - GBP (£) £ in Millions	May 15, 2023	Feb. 22, 2023	Jun. 30, 2023
Discontinued Operations (Details) [Line Items]
Loss on sale	£ 7.0
Net cash inflow			£ 19.2
Disposal groups classified as held for sale [member]
Discontinued Operations (Details) [Line Items]
Consideration for sale	£ 21.2
Third party [Member]
Discontinued Operations (Details) [Line Items]
Loss on sale		£ 0.7