While internally debating about whether to borrow John's bike while he's away in order to avoid taking the evil bus to work, I never considered whether I could actually make the trip or not. I considered the discomfort of biking in the rain, the potential difficulty of remembering to stay on the correct side of the road, and the fact that I don't have a helmet yet, but I just took for granted that I'd cruise along between Cutteslowe and Headington.
Anyway, 5 miles later, I'm exhausted (I know, Scott, you're disappointed in me). But it's a lot faster than taking the bus, even for a lard-ass like me. Plus I save £3/day (and hopefully lose some pounds from my gut; hardy har har).