Hi Jollyman,
We recently got Alu Clad windows for a new build and like you were wondering what colour to get. Single story house with converted attic, so only downstairs windows, velux upstairs at the back. With the help of the window suppliers, we chose Black Brown Ral 8022, will be painting the outside white 9001 - which is actually stated as cream, but will be fairly white. Delighted with the window colours, they're not Black Black, if you know what I mean. Soffit & Fascia will be black. Hope this helps somewhat.