Great White Egret or Little Egret??

I visited RSPB Marshside on Friday last week, inbetween all the recent wind and rain ,it was quite nice and with some blue sky. The marsh was stuffed full of birds, but on my way home whilst driving down the coastal road the bird below caught my eye flying over the estuary side of the road, I followed until it settled by a small pool, and managed a photo at great distance and heavily cropped. Forgive the blurred flight photo, not easy from a moving car! I am unsure but i am hoping it is a Great White Egret, anyone help? Thanks Gary