Let me guess what was in it: cheap, plastic crap for Christmas presents. When I was driving container lorries, this, in the lead-up to Christmas, was a very busy time and, in my experience,cheap, plastic crap was the usual load (maybe they didn't trust me with the high-value stuff like computers and Nintendos!).
I would be most interested, though, to learn what is in that box when it leaves the UK and for where it is headed. But I suppose that, now the box is back in Blighty, the story ends.