That depends on where in the world you are mailing from and what you are mailing. Prices change all the time. You need to contact your local post office.
Yes, Royal Mail is the only Postal Service in Northern Ireland.
Northern Ireland is much bigger.
There is no toll charge on the M1 or any road in Northern Ireland.
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Royal Mail website if you know the address of the location.
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It will be whatever your network provider charges ! Northern Ireland is part of the UK !
Second class post
60c-90c
Dublin
There is the border between the Republic of Ireland and Northern Ireland, in the northern part of Ireland. The most northern point on the island of Ireland is actually in the Republic of Ireland, not Northern Ireland, as you will see at the map at the link below. Around the northern coast, is the Atlantic Ocean.
£30.50 for a car!