Annual report pursuant to Section 13 and 15(d)

Sale of Weald Basin Assets (Details)

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Sale of Weald Basin Assets (Details) - GBP (£)
£ in Thousands, shares in Millions
Aug. 11, 2016
Jun. 10, 2016
Sep. 09, 2016
Celtique Claim | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Litigation settlement, amount £ 500    
MPUK | Celtique Claim | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Litigation settlement, amount 500    
MPUK | Weald ATA, IoW ATA, and Settlement Agreement | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net cash proceeds from sale £ 446    
MPUK | UKOG | Asset Transfer Agreement | UK Oil and Gas Investments      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ownership percentage, sold in period   50.00%  
Total consideration   £ 1,800  
MPUK | UKOG | Asset Transfer Agreement | Offshore Petroleum Licence      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ownership percentage, sold in period   22.50%  
UK Oil and Gas Investments | MPUK | UKOG | Weald ATA, IoW ATA, and Settlement Agreement | Subsequent Event      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Investment owned (in shares) 50.9    
Investment owned, value £ 703   £ 958