Royal Mail has temporarily suspended all mail services to Europe, apart from the Republic of Ireland, due to a UK travel ban triggered by the discovery of a new faster spreading mutant coronavirus strain.
The company also said it is adding Canada and Turkey to its "on suspension" list due to delays caused by "severely limited" air capacity.
Royal Mail also said it could not guarantee special delivery items posted on 23 December would arrive before Christmas due to tighter covid restrictions being introduced in England.
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