Ok, when I first started with WP way back in 1724, I used divs withina blockquote which I no longer do - this was to add the second set of speech marks.
After about 100 years I finally decided that I did't need speech marks anymore and modified the blockquotes and simply forget about the ones that included the divs.
3oo years on and I'm playing with blockquotes and have just discovered the problem from 1724 where I used divs - so I is there I way that I can do a mass search and edit through all my entries and find an instance of
</div></blockquote> and modify it so that it's just the standard blockquote tags, taking into account there will between the tags. There is a plugin that springs to mind but it's been hundreds of years and my memory is going.
Thanks in advance