Although it could be argued that the pantry is a separate room to the new bathroom, it's not prudent to have power near water, or to have to rustle through the bathroom in the dark when the house juice or a lighting circuit goes.
I'd go with the access being moved and a door in to a common easy access area such as the hall / landing. It the area is big enough, it makes sense since such rooms become the house dump for ironing board, hoover etc..
I can only assume the latter of the two. There's nothing I'm aware of that would stop you from dhaving your CU in a room adjacent to the bathroom, but as already mentioned, it wouldn't be practical or convenient and effectively wastes the room if there is no other access.
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