So here is what I just saw:
The only extant manuscript of Beowulf
A manuscript of Sir Gawain and the Green Knight
A manuscript of The Canterbury Tales (1410)
A King James Bible, 1611
A first edition of Robinson Crusoe
The only manuscript draft (excerpt) of one of Jane Austen's novels
A handwritten manuscript of Finnegan's Wake
And so much more that I can't even remember it all.
It's all in a fantastic exhibition at the British Library.
Not a bad way to end the trip. Tomorrow morning, I'm homeward bound!