When the proposal was announced in 2010, about 500 people took part in a joint protest at the Tamar Bridge which joins Cornwall and Devon.

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It is notable, too, that Yevgeny Shvidler, head of Sibneft, one of Mr Berezovsky's supposed assets, has signed the joint letter of protest.

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Greece has withdrawn from joint military exercises with Israel in protest at the raid on the flotilla.

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Last month, the DUP leader and the leader of the other main unionist party, the UUP, issued a joint statement calling for a move "beyond protest" to a political solution and announced they were setting up a unionist forum to address cultural issues.

BBC: Peter Robinson