I've just detached this from another Bagley topic where it had been overlooked (which highlights the difficulty of not starting a separate topic for a new item). As tarkl has only made this one post and hasn't visited the board since early 2010 I'm hoping she's still at the same email address and will pop back in and add some photos of these eggcups.
Angela Bowey's 3rd edition of Bagley Glass mentions that there was only one style of Bagley eggcups (Queen's Choice pattern) and that some of them were made as Edward VIII's Coronation issue but that these were ordered destroyed when he abdicated, so it seems that few of them are known.