Thanks Jeremy and apologies for making you cook your veggies twice!
I think you will find this post interesting: post30430.html#p30430
I would ordinarily feel like a dill right about now, but unfortunately, searching for virtualbox or qemu results in this message:
The following words in your search query were ignored because they are too common words: virtualbox.
You must specify at least one word to search for. Each word must consist of at least 3 characters and must not contain more than 14 characters excluding wildcards.
However, having now searched for 'integration' it is obvious I'm still a dill as I should have thought of that word - bummer, I just can't win.