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Wyatt if you go to a drug store ask someone for the dental emergency kits section. It may be near where they have toothpaste. There are these tubes of very watered-down novocaine and also some temporary dental bonding cement to seal the fissure.
That won't do anything for you permanently but it should last you for a few days. That and some extra strength aspirin should help out. Though if it's bleeding don't take the aspirin.
I hope they have that stuff in Britain. I mean you should, considering you guys get drugs and shit before we do.
also if it's a deep crack and is hurting really bad you can go to the emergency room over it (as infections in your teeth can actually kill you). they won't do anything pretty but they'll stop you from having lots of pain.
otherwise you're going to have to wait until you have the cash for a dentist.
Come to Belgium, become a Belgian citizen and enjoy free medical care
but seriously, you should see a dentist. There isn't much else you can do I'm afraid.
do you have any silly putty or those moldable erasers? If you bite down on that and pop some aspirin you can probably make it until morning. I had to do that once a long ass time ago when I was too drunk to drive to the drugstore.