ID this pair of birds

I saw two large white waders on the marshes this morning, I would say they were at least twice the size of a Little Egret but were very similar apart from that. They were a long way for my 400mm and these images are well cropped but can anyone ID them for me?

large white bird-13 large white bird-12 large white bird-11 (there's a Lapwing in this one which gives an idea how big they are) large white bird-9 large white bird-8