However, it is not something we can entirely dismiss as inadmissible.

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Under Article 12, any evidence that is not acquired or transmitted under the terms of the 1959 convention would be inadmissible in Italian courts.

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Correspondence between the Parliamentary standards commissioner and Mr MacShane is, however, covered by privilege and could not be used in court - but "it is likely to be inadmissible anyway", added Mr Barron.

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Ms Dowd would not answer questions about whether a diary, described a Sunday Times article as "dynamite", had been ruled inadmissible as evidence.

BBC: NEWS | UK | UK Politics | Key points: Cash-for-honours hearing