Seems a little more checking on the names might have been useful.
Meconopsis grandis 'Himal Sky' is the name which has, I believe - been given to the plant formerly known as ES104. ( This is in the seedlist as ...
grandis ex ES104 seed number 2654)
Pictures from the RHS trials have ES104 listed as being 'Himal Sky' and ES104 was previously shown as being a "true
grandis form "
As to the
M. sulphurea - perhaps this is one of C.G-W's recent rehashes, or maybe Alan Elliott or Ian Christie can drop by and enlighten us!