Sorry everyone got the web address wrong - the People's Collection site is of course :- http://www.peoplescollection.wales/discover
By simply putting Skokholm into the search tab you get all the pictures. You can categorise them using the What and When tabs or even inputting a search tag such as "Skokholm, Buildings" - these features will become more valuable as the collection grows.
You can also create your own group of photo's by setting up your own account and tagging pictures as favourites. Its a powerful site but takes a bit of learning.