I finally managed to get this picture on and fortunately it shows what is required.
Left is the yellow-faced albino with a normal albino on the right, I produced both last year and the parents are currently sitting on five eggs.
The yellow-face mutation comes in two forms, Type 1 and Type 2 .
Mine has the Type 2 which is richer in colour and also puts a yellow suffusion on the body of the bird.
HWH.