I want to give cyclocross racing a shot.
What size bike should I get?
Should it be the same size as my road bike or slightly smaller for getting round the course?

Dude. You posted the same question less than an hour ago.

http://singletrackworld.com/forum/topic/cyclocross-bike-advice

Just bump the old thread, or have a little patience.

Generally go for a size down from your road bike. I’m 5’9 and ride a 54cm road bike so i have a 52 CX bike and it seems to work well for most. I’d also consider a bike with a disc set up as that was the first thing i changed after i’d done a few races, canti brakes just don’t work and having some sort of stop-ability is rather nice when you’re bombing round a muddy CX course.

Sorry Jamie. Should be a Luddite button somewhere, didn’t do it on purpose…
Thanks epo, kinda what I thought about frame size, I’m looking for an ebay/gumtree bargain with or without discs, hopefully we see you out there this winter.