- Porvair said its H1 pretax profit rose 27% to £3.8m, from a restated £3.0m. Revenues rose 32% to £51.0m, from £38.6m. The company hiked its interim dividend to 1.2p a share, from 1.1p.

"Porvair's strategic direction and operating objectives are unchanged and continue to deliver good results. We focus on niche markets which have structural growth drivers," said CEO Ben Stocks in a statement.

He said "2014 has started strongly, and order books are healthy across the Group.

"The revenue benefits of previously announced large contracts are showing through with underlying growth also healthy. We continue to invest in US and UK capacity expansion and new product development. There is considerable opportunity in the Porvair businesses. The Board's outlook remains positive."

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