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Basis of preparation (Tables)
12 Months Ended
Dec. 31, 2025
Basis of preparation  
The exchange rates used for the translation of currencies

  ​ ​ ​

2025

  ​ ​ ​

2024

  ​ ​ ​

2023

Average rates

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  ​

  ​

Sterling

1.32

1.28

1.24

Euro

1.13

1.08

1.08

Swiss Franc

1.20

1.14

1.11

Japanese Yen

0.0067

0.0066

0.0071

Year end rates

Sterling

1.35

1.25

1.27

Euro

1.17

1.04

1.10

Swiss Franc

1.26

1.10

1.19

Japanese Yen

0.0064

0.0064

0.0071