Great white or Little egret?

Whilst away with the family for the weekend I managed to get a little bit of time for bird watching. I am undecided as to which species of Egret this is. The little egret is more common, however this did seem to be quite on the large side! Unfortunately there is nothing within the photo that can be used to scale to bird either. The egret was however more equally sized to the nearby Grey heron.
The bird was seen between Llandudno and Conwy.