| Intangible assets | 12.43a | 12.92a |
| Property, plant and equipment | 23.38a | 22.56a |
| Right-of-use assets | 3.33a | 3.64a |
| Derivative financial instruments | 0.9a | 1.02a |
| Investments | 0.02a | 0.03a |
| Joint ventures and associates | 0.25a | 0.31a |
| Trade and other receivables | 0.66a | 0.64a |
| Preference shares in joint ventures | 0.23a | 0.45a |
| Contract assets | 0.31a | 0.33a |
| Retirement benefit surplus | 0.14a | 0.07a |
| Deferred tax assets | 0.96a | 1.05a |
| Non-current assets | 42.61a | 43.02a |
| Inventories | 0.33a | 0.41a |
| Trade and other receivables | 3.11a | 3.57a |
| Preference shares in joint ventures | 0.16a | 0.08a |
| Contract assets | 1.19a | 1.41a |
| Assets classified as held for sale | 0.25a | |
| Current tax receivable | 0.36a | 0.42a |
| Derivative financial instruments | 0.13a | 0.05a |
| Investments | 2.63a | 2.37a |
| Cash and cash equivalents | 0.22a | 0.41a |
| Current assets | 8.37a | 8.72a |
| Loans and other borrowings | 2.09a | 1.4a |
| Derivative financial instruments | 0.11a | 0.09a |
| Trade and other payables | 5.96a | 6.33a |
| Contract liabilities | 0.9a | 0.91a |
| Lease liabilities | 0.71a | 0.77a |
| Liabilities classified as held for sale | 0.19a | |
| Current tax liabilities | 0.08a | 0.09a |
| Provisions | 0.26a | 0.24a |
| Current liabilities | 10.29a | 9.82a |
| Total assets less current liabilities | 40.7a | 41.92a |
| Loans and other borrowings | 16.67a | 17.13a |
| Derivative financial instruments | 0.39a | 0.45a |
| Contract liabilities | 0.26a | 0.18a |
| Lease liabilities | 3.87a | 4.19a |
| Retirement benefit obligations | 4.23a | 4.88a |
| Other payables | 0.28a | 0.64a |
| Deferred tax liabilities | 1.72a | 1.53a |
| Provisions | 0.38a | 0.41a |
| Non-current liabilities | 27.79a | 29.4a |
| Share capital | 0.5a | 0.5a |
| Share premium | 1.05a | 1.05a |
| Own shares | -0.38a | -0.31a |
| Merger reserve | 1a | 1a |
| Other reserves | 0.83a | 0.72a |
| Retained earnings | 9.91a | 9.57a |
| Total equity | 12.91a | 12.52a |