The top recession-proof investments

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This month saw BSkyB deliver a solid (but dull) set of results, with revenues up 5% to £5.1 billion in the nine months to March, despite the company freezing customer prices. Broadband and telephony are booming, with the strongest ever quarter for new customers.

It goes to show that a company does not have to be an exciting growth story to be a good investment. What other 'recession-proof' investments are out there?