2013-07-20 Sat/Sun - Dunwich Dynamo DD21

Why is everybody talking about their serious preparations for this ride, pls?

I haven't bothered with any preparations other than buying a bag of jelly snakes, is there something I should know about this ride?

Sparky's Dunwich Dynamo preparation tips:

1. Find a bike that works. Or, at least, pick the one that's currently least broken.
   
2. Buy some chips at London Fields to stock up on all the vital energy group nutrient science-things that your belly and legs need for top performance.
   
3. Follow someone who looks like they know where they're going.
   
4. Success.