I need a recording for my animation and I found one with no problem at all!
My original intention was to get a big bombastic American voice but I re-evaluated when I thought that I was doing this for The British Science Museum, so I opted for a calmer, more educational voice.
David Johnston has worked for the likes of BBC and was kind enough to do this recording for Free. I emailed him asking about it yesterday and today, after some more emails, I have it here.
EDIT: I just heard David Johnston on the Radio!