This is Bethany House's
Pride and Prejudice by Jane Austen with notes by their staff
Brits don't need to be told what a fortnight is but their explanation of 'entail' isn't bad (I have seen a really awful one from an American academic )
Also interesting from a book design point of view since the notes appear as sidebars so don't need a click to read click to return sequence.
Free
http://www.amazon.com/dp/B00B85AFCO/
http://www.amazon.co.uk/dp/B00B85AFCO/
http://www.amazon.ca/dp/B00B85AFCO/
http://www.amazon.com.au/dp/B00B85AFCO/