| | Average fair value of share options vested during the year | 10 | – |
| | Share-based cost recognised | 37 | 21 |
28 | Commitments and contingencies | | |
| | Capital expenditure commitments | | |
| | Contracts for capital expenditure | 27 | 31 |
| | Authorised by the directors but not contracted for | – | 196 |
| | Total capital commitments | 27 | 227 |
| | | | |
| | This expenditure will be financed from existing resources and where appropriate, borrowings. | | |
| | | | |
| | Contingent liabilities | | |
| | Environmental guarantees | 201 | 28 |
| | | | |
| | Refer to note 36 in the group financial statements for a discussion on contingent liabilities. | | |