Not sure of the actual address but this may help. Post Office Tel: 01481 832005 There are no Sark stamps so each letter is franked by hand. Sark Post Office is also the official Bureau de Change on the Island. Open Monday to Saturday 8:30am – 5:00pm & open some Sundays. Maybe just send a letter addressed to "Post Office" Sark.
Gallery Stores Tel: 01481 832078 Everything for your home, garden and office as well as mobile phones, phone top ups and fuel. Also home to our Sark Post Office.
The Gallery Stores, Sark Name: The Gallery Stores Address: The Ave Postcode/City: GY10 1SB Sark County: Guernsey Channel Islands Phone: 01481 832078 Fax: 01481 832815
Thankyou