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Are you sure that the second and third pictures are not a Sandwich Tern? It looks more like it to me, with a black mask in the second picture, short tail, stocky body, bill appears to have pale tip.
My Flickr photos...
Photos taken within seconds of one another so if the last two are so is the first. But on reflection I think you might be right. You should add the correct ID and get credit for it.
There were loads of Common Terns about and I rather lazily assumed that is what I caught in the camera.
Lat/Lng: 54.494271465286, -0.63540458679199
OS grid ref: NZ884118