Many thanks for your replies, guys.
I've read (or rather, skimmed) through the entire thread on the Modify EPUB plugin. Even though I'm not exactly computer illiterate, I was lost in a sea of code and even more confusion!
I should perhaps explain my situation a little better.
As mentioned in the OP, I recently downloaded Orwell's 1984 (from MobileRead). I wasn't a fan of the cover that was already in place, so I updated the metadata of the EPUB and downloaded a much more interesting cover.
As far as I was aware there and then, the cover of the book had been changed. But I later discovered that in reality on the thumbnail had been changed. So I had the new cover on display in the right side pane in Calibre, and also on display when browsing by cover on my Sony PRS-350. I used the 'Copy Cover' plugin to enable me to set the 'cover' as the stanby 'screensaver'. That worked fine. When I go into standby mode I have the iconic 1984 book cover on display.
When I open the EPUB, I am greeted with the older cover. This is the same regardless of whether I open the file with Calibre, EPUBReader, or my Sony PRS-350.
So the cover is not updated in the file itself. I understand that much. How do I update it and at the same time remove the old cover?
I do not understand how this modify plugin works. I don't know what 'manifested' files are, but I have through trial and error worked out what a book jacket is.
Could anybody help further.
Many thanks, and much appreciation for your patience.
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