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Intangible assets - Other intangible assets (Details) - GBP (£) | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | --- | ---
Intangible assets |  |  |  |
Intangible assets and goodwill | £ 777,473,000 | £ 775,170,000 | £ 758,476,000 | £ 768,857,000
Cost / gross value |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | 1,303,033,000 | 1,267,525,000 | 1,207,618,000 | 1,207,745,000
Accumulated depreciation, amortization and impairment |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | (525,560,000) | (492,355,000) | (449,142,000) | (438,888,000)
Other intangible assets |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | 5,668,000 | 6,845,000 | 7,846,000 | 8,642,000
Other intangible assets | Cost / gross value |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | 15,561,000 | 14,797,000 | 14,076,000 | 13,964,000
Other intangible assets | Cost / gross value | Internally generated |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | 2,098,000 |  | 2,076,000 |
Other intangible assets | Accumulated depreciation, amortization and impairment |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | (9,893,000) | £ (7,952,000) | (6,230,000) | £ (5,322,000)
Other intangible assets | Accumulated depreciation, amortization and impairment | Internally generated |  |  |  |
Intangible assets |  |  |  |
Intangible assets and goodwill | £ (1,667,000) |  | £ (1,065,000) |

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