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Sorry I didn't come back sooner, I'd forgotten about it & only remembered today so have ordered one just in time. (Would have ordered 2, as we need it on 2 PCs & 1 laptop, but DS2's college isn't on their database for some reason)
(The ac.uk thing is an academic email address & these cheap offers I'd heard of before could only be ordered from one of those; I think this is probably even better, esp as you can use it on 2 machines. Super bargain!)