Before the late 1980s, seeing a little egret in the UK would have been rare. Now they are everywhere. I have even seen these in our village.
Now it is the turn of the cattle egrets, which are becoming increasingly common in Devon. These are slightly smaller than little egrets with a different bill colour. They tend to be near cattle.
See https://www.rspb.org.uk/birds-and-wildlife/bird-and-wildlife-guides/bird-a-z/c/cattleegret/