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Tangible fixed assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Tangible fixed assets |
Schedule of movements in tangible fixed assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Total
​ | ​ | ​ | ​ | Other tangible | ​ | tangible fixed
Cost |  | Vessels |  | assets |  | assets
As of January 1, 2021 |  | 2,873,829 | ​ | 2,719 | ​ | 2,876,548
Additions, net |  | 12,073 | ​ | 1,370 | ​ | 13,443
Disposals |  | (190,295) | ​ | — | ​ | (190,295)
Fully amortized dry-docking component | ​ | (14,512) | ​ | — | ​ | (14,512)
As of December 31, 2021 |  | 2,681,095 | ​ | 4,089 | ​ | 2,685,184
Additions, net |  | 1,835 | ​ | 1,523 | ​ | 3,358
Transfer under Vessels held for sale | ​ | (324,034) | ​ | — | ​ | (324,034)
As of December 31, 2022 |  | 2,358,896 | ​ | 5,612 | ​ | 2,364,508
Accumulated depreciation and impairment loss |  | ​ | ​ | ​ | ​ | ​
As of January 1, 2021 |  | 669,930 | ​ | — | ​ | 669,930
Depreciation |  | 81,937 | ​ | — | ​ | 81,937
Disposals | ​ | (44,731) | ​ | — | ​ | (44,731)
Impairment loss on vessels | ​ | 103,977 | ​ | — | ​ | 103,977
Fully amortized dry-docking component |  | (14,512) | ​ | — | ​ | (14,512)
As of December 31, 2021 |  | 796,601 | ​ | — | ​ | 796,601
Depreciation |  | 68,264 | ​ | — | ​ | 68,264
Transfer under Vessels held for sale | ​ | (182,572) | ​ | — | ​ | (182,572)
Impairment loss on vessels | ​ | 4,444 | ​ | — | ​ | 4,444
As of December 31, 2022 |  | 686,737 | ​ | — | ​ | 686,737
Net book value |  | ​ | ​ | ​ | ​ | ​
As of December 31, 2021 |  | 1,884,494 | ​ | 4,089 | ​ | 1,888,583
As of December 31, 2022 |  | 1,672,159 | ​ | 5,612 | ​ | 1,677,771
​
Schedule of impairment loss recognized for vessels | ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31, 2022
Vessel | ​ | Impairment loss on vessels |  | Recoverable amount
Methane Jane Elizabeth |  | (1,412) |  | 65,408
Methane Alison Victoria |  | (3,032) |  | 64,992
Total |  | (4,444) |  | 130,400
​

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