Environmental technology group Porvair said 2013 had started well with revenue and profit in the last four months both ahead on the previous year.

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Porvair is another of those British industrial companies doing all the right things on the global stage. It makes filters for aviation and energy markets and metals foundries and has increased revenues by an average of 11 per cent a year through the recession. More than half its production is in the UK. The key to future performance will be the introduction of new and increasingly sophisticated ranges of filters. More than four fifths of sales are of product that needs regular replacement, which gives some security of future earnings. Porvair is not immune to the world economy — in 2009, America’s carmakers shut up shop for four months and so did its business serving that industry. The shares, on about 17 times earnings, have had a fair run but look a good bet long term, The Times´s Tempus believes.

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Environmental technology group Porvair reported a 40 per cent increase in annual pre-tax profit but said while 2013 has started well, with healthy order books, it remains cautious about the general economic outlook.

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