By William James and Philip Blenkinsop LONDON/BRUSSELS (Reuters) -Britain and Ireland traded barbs on Twitter on Sunday after British Brexit negotiator David Frost restated his view that the EU must agree “significant change” to the Northern Ireland protocol that governs trade and border rules in the province. The protocol was part of the Brexit settlement Prime Minister Boris Johnson negotiated with the EU, but London has repeatedly said it must be rewritten less than a year after taking force due to the barriers businesses face when importing British goods into Northern Ireland. Ireland’s fo…

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