 The economic mainstay of the island is now ecological tourism , based around the farmhouse , which is operated by the Lihou Charitable Trust , although overall responsibility for the island remains with the Environment Department of the States of Guernsey . Lihou and several other small Channel Islands such as Herm and Sark , issued their own stamps until 1969 , when the States of Guernsey assumed responsibility for postal services in the Bailiwick , which had previously been provided by the UK Government . 
