I have tried to collate the sources of information for Victorian mintage numbers, ie annual reports, trial of the pyx records, parliamentary returns and other documentary mentions to see if it might be possible to derive any plausible estimates. After many hours of crunching the numbers, I concluded that it would not be possible without having access to the Royal Mint day books.
Which you should be able to get under the freedom of information act?
Mark
You wouldn't need a FoI request, but you would need to go to the National Archives at Kew and spend many many hours delving through the records.