Update

I'm back in London, trying to figure out where to go next. I've got £30 in my pocket, $40 on my card. I may head straight for Canterbury, where I was planning on crashing at my friends' place anyway, or I may just wing it in London hostels. Portsmouth, for now, is out of the question.

I need to rendezvous with my professor and see about using his phone.

And to think I almost brought a credit card with me...