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Share-based payments (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Information about Awards Granted
   
APP
   
LTIP
 
   
Binomial valuation model
   
Monte Carlo Simulation and
Binomial valuation model
 
   
2019
   2018   2017   
2019
  2018  2017 
Weighted average share price
  
 
4,597.0p
 
   4,645.0p    3,781.0p   
 
4,850.0p
 
  4,774.0p   4,300.0p 
   
 
 
   
 
 
   
 
 
   
 
 
  
 
 
  
 
 
 
Expected dividend yield
  
 
n/a
 
   n/a    n/a   
 
2.16
  2.27  2.05
                  
 
 
  
 
 
  
 
 
 
Risk-free interest rate
                 
 
0.72
  0.84  0.10
                  
 
 
  
 
 
  
 
 
 
Volatility
a
                 
 
19
  25  24
                  
 
 
  
 
 
  
 
 
 
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 2017
   685    4,201    449 
   
 
 
   
 
 
   
 
 
 
Granted
   235    280    525 
   
 
 
   
 
 
   
 
 
 
Vested
   (263   (928   —   
   
 
 
   
 
 
   
 
 
 
Share capital consolidation
   (21   —      —   
   
 
 
   
 
 
   
 
 
 
Lapsed or cancelled
   (20   (1,160   (58
   
 
 
   
 
 
   
 
 
 
Outstanding at 31 December 2017
   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 201
9
  
 
496
 
  
 
695
 
  
 
1,275
 
   
 
 
   
 
 
   
 
 
 
Fair value of awards granted during the year (cents)
               
2019
  
 
5,888.7
 
  
 
4,985.6
 
  
 
5,862.1
 
   
 
 
   
 
 
   
 
 
 
2018
   6,066.2    4,748.7    5,966.0 
   
 
 
   
 
 
   
 
 
 
2017
   4,959.3    4,133.2    5,251.0 
   
 
 
   
 
 
   
 
 
 
Weighted average remaining contract life (years)
               
At 31 December 2019
  
 
1.1
 
  
 
1.3
 
  
 
1.2
 
   
 
 
   
 
 
   
 
 
 
At 31 December 2018
   1.0    0.8    1.2 
   
 
 
   
 
 
   
 
 
 
At 31 December 2017
   1.2    0.6    1.7