An example is engineering and construction group Balfour Beatty, one of the preferred bidders for London Underground PPP, which reported in August that PFIs underpinned its 17% rise in underlying profit growth.

BBC: Private company bonanza

The longtime technology investor points to startup consumer electronics company, Sling Media, as an example of a firm that has California headquarters but relies on overseas operations for a big chunk of its engineering work.

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