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Share-based payments (Tables) | 12 Months Ended
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Dec. 31, 2020
Text block [abstract] |
Summary of Information about Awards Granted | The following table sets out information about awards granted in 2020, 2019 and 2018 under the APP and LTIP. The total fair value of the Colleague Share Plan is not significant.​​​​​​​
|  | APP |  |  | LTIP |
|  | Binomial valuation model |  |  | Monte Carlo Simulation and Binomial valuation model |
|  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2020 |  |  | 2019 |  |  | 2018 |
Weighted average share price (pence) |  |  | 3,771.0 |  |  |  | 4,597.0 |  |  |  | 4,645.0 |  |  |  | 3,450.0 |  |  |  | 4,850.0 |  |  |  | 4,774.0 |
Expected dividend yield |  |  | n/a |  |  |  | n/a |  |  |  | n/a |  |  |  | 1.48 | % |  |  | 2.16 | % |  |  | 2.27 | %
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.02 | % |  |  | 0.72 | % |  |  | 0.84 | %
Volatility a |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 | % |  |  | 19 | % |  |  | 25 | %
Term (years) |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 3.0 |
a | The expected volatility was determined by calculating the historical volatility of the Company’s share price corresponding to the expected life of the share award.
Summary of Movements in Awards Outstanding Under the Schemes | Movements in the awards outstanding under the schemes are as follows:
|  | APP |  |  | LTIP |
|  | Number of shares thousands |  |  | Performance-related awards Number of shares thousands |  |  | Restricted stock units Number of shares thousands |
Outstanding at 1 January 2018 |  |  | 616 |  |  |  | 2,393 |  |  |  | 916 |
Granted |  |  | 176 |  |  |  | 257 |  |  |  | 527 |
Vested |  |  | (199 | ) |  |  | (702 | ) |  |  | — |
Lapsed or cancelled |  |  | (2 | ) |  |  | (860 | ) |  |  | (142 | )
Outstanding at 31 December 2018 |  |  | 591 |  |  |  | 1,088 |  |  |  | 1,301 |
Granted |  |  | 217 |  |  |  | 287 |  |  |  | 540 |
Vested |  |  | (276 | ) |  |  | (293 | ) |  |  | (422 | )
Share capital consolidation |  |  | (21 | ) |  |  | — |  |  |  | — |
Lapsed or cancelled |  |  | (15 | ) |  |  | (387 | ) |  |  | (144 | )
Outstanding at 31 December 2019 |  |  | 496 |  |  |  | 695 |  |  |  | 1,275 |
Granted |  |  | 138 |  |  |  | 383 |  |  |  | 696 |
Vested |  |  | (188 | ) |  |  | (179 | ) |  |  | (413 | )
Lapsed or cancelled |  |  | (33 | ) |  |  | (85 | ) |  |  | (137 | )
Outstanding at 31 December 2020 |  |  | 413 |  |  |  | 814 |  |  |  | 1,421 |
Fair value of awards granted during the year (cents) |  |  |  |  |  |  |  |  |  |  |  |
2020 |  |  | 4,965.9 |  |  |  | 2,473.5 |  |  |  | 4,397.5 |
2019 |  |  | 5,888.7 |  |  |  | 4,985.6 |  |  |  | 5,862.1 |
2018 |  |  | 6,066.2 |  |  |  | 4,748.7 |  |  |  | 5,966.0 |
Weighted average remaining contract life (years) |  |  |  |  |  |  |  |  |  |  |  |
At 31 December 2020 |  |  | 1.0 |  |  |  | 1.4 |  |  |  | 1.3 |
At 31 December 2019 |  |  | 1.1 |  |  |  | 1.3 |  |  |  | 1.2 |
At 31 December 2018 |  |  | 1.0 |  |  |  | 0.8 |  |  |  | 1.2 |

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- Definition The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The disclosure of the number and weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 + Details
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