Civil Liability (Contribution) Act 1978

The Civil Liability (Contribution) Act provides, subject to certain other provisions, ‘any person liable in respect of any damage suffered by another person may recover contribution from another person liable in respect of the same damage.’ [1]  
Subject to the exact meaning of ‘the same damage’ this gives a wide scope for actions for damages being brought against architects, engineers and the like by people they have not even met – let alone contracted with.

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[1] The Civil Liability (Contribution) Act 1978, s.1 (1).