I appear to have won a place on this year's London to Brighton bike ride. The competition organisers have been kind enough to give three days notice 
The thing is, I haven't trained. I've only been out on my road bike once. I'm fairly sure I can do the distance, but from what I've read (on here mainly - old threads) is that the ride is a bit tricky in terms of the sheer volume of people? Not to mention a big hill near the end... And how am I supposed to get to London for an early start, and back to Sheffield from Brighton with two bikes?!
Has anyone done this ride? Is it worth the hassle of trying to get there/back, or should I just say cheers, but let someone else have the prize? As far as I can tell, it's going to cost ~£200 for travel with this late notice...
Words of wisdom please 