| Half year to 30 June 2016 | Half year to 30 June 2015 |
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Revenue | £291.0m | £299.8m |
Headline operating profit1 | £49.3m | £54.1m |
Return on sales2 | 16.9% | 18.0% |
Operating profit | £47.1m | £32.1m |
Headline profit before taxation1 | £48.1m | £52.6m |
Profit before taxation | £45.9m | £30.6m |
Headline operating cash flow3 | £38.0m | £40.2m |
Operating cash flow4 | £33.7m | £36.7m |
Net debt | £5.5m | £7.0m |
Basic headline earnings per share5 | 18.3p | 21.1p |
Basic earnings per share5 | 17.5p | 10.6p |
Interim dividend per share6 | 5.0p | 4.8p |