When I visited in mid June 2015 there were many seabirds nesting on both holms, although there were considerably more on Outer Holm than Inner Holm. The oystercatchers were particularly annoyed by my presence, so I didn't linger long and quickly walked across the island and crossed to Outer Holm. I also saw geese, eider ducks, great black backed gulls and a few terns. Inner Holm is covered in rough grass and the thrift and birds foot trefoil were in flower.
Cairn at Whale Point - looking north towards the Holms
Inner Holm from Whale Point
Cairn on Inner Holm of Ire
These 4 circular and 2 square stone structures are planticrubs, which were used to shelter plants like kale. They are far more common on Shetland than Orkney.
Cairn at the north end of Inner Holm - it is marked on the 1:25,000 scale map, so has obviously been there a while.
North end of Inner Holm - I have no idea what if anything this pole is meant to signify
A ruined chapel is shown on the OS map at the south end of Inner Holm but I am not sure if this is it or maybe this another planticrub. The chapel was dedicated to St Colm.
Or maybe these are the chapel ruins?
Or maybe this?
Thrift and birds foot trefoil at the south end of Inner Holm