Gang gang Cockatoo

Been for a fab run this morning and spied these handsome birds near a tree by our drive.  I shot up to the house to grab the camera, I didn't need to be so quick, they were not in any hurry!  I am sure a blipper can tell me the correct name of these birds? thank you Feather for providing the name!  I have done a search in google but do not appear to be coming up with anything.

Anyway, nice early blip in the bag, best to get on with some work now!!