| Revenue from operations | 51,032a | 51,397a |
| Other income | 810a | 639a |
| Total income | 51,842a | 52,036a |
| Expenses | — | — |
| Cost of materials consumed | -27,184a | -25,418a |
| Purchases of stock-in-trade | -1,393a | -2,773a |
| Changes in inventories of finished goods, work-in-progress and stock-in-trade | -539a | -31a |
| Employee benefits expense | -4,354a | -5,343a |
| Finance costs | -196a | -223a |
| Depreciation and amortisation expense | -740a | -795a |
| Impairment of non-current assets | -155a | |
| Other expenses | -7,867a | -8,652a |
| Total expenses | -42,428a | -43,173a |
| Profit before exceptional items and tax | 9,414a | 8,863a |
| Add: exceptional item | — | — |
| Profit on sale of environmental science business | | 1,038a |
| Profit before tax | 9,414a | 9,901a |
| Current tax | -1,984a | -2,207a |
| Deferred tax | -25a | -106a |
| Fringe benefit tax | | -6a |
| Tax expense | -2,009a | -2,319a |
| Profit for the year | 7,405a | 7,582a |