Membership of IoHDT Home / IoHDT / Membership of IoHDT To apply for membership of the Island of Hoy Development Trust (IoHDT) please download, complete and submit the Membership Form Share this:ShareClick to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email this to a friend (Opens in new window)