In August, 2014, the cost of sending a letter from England to Ireland using International Standard royal mail is £1.47. Delivery takes from three to five business days.
Additional services, such as international tracking and delivery confirmation, can increase the cost up to £7.76. Letters can weigh no more than 100 grams (approximately 3.5 ounces) and must have a value of less than £20 for International Standard or up to £50 with tracking and delivery confirmation. Mail from England to Ireland does not need customs declaration. The Irish Post has a lengthy list of prohibited items that one should consult before sending any items.