The Professor writes:
All here is well. Until today the weather was terribly crappy and we’ve postponed our Stonehenge trip until Sunday. Probably heading west from London tomorrow or Friday but we’re really just having a good time hanging out. I’ve spent the last few days in the British Library trying to get some work done and have even succeed to a surprising degree. I saw the original copy of Beowulf there, but I couldn’t read it.
All I can say is that, if that woman doesn’t have a megalith of some sort as a souvenir for me, I’m going to be disappointed.
Tiny Cat Pants 
Can I carry-on a megalith?
As long as you can find some bronze-age Britons to help you lift it into the overhead compartment, sure.
I didn’t find any Britons to bring home with me, or even just onto the plane temporarily, but I found a tiny trinket or two. Don’t get too excited though; so much stuff was the bad kind of cheesy. Had a good time. I’ll be home soon.