Air Jamaica
For my 2p worth - and I havent got a place at CTC, so there are probably those who are better informed. I would keep the dreads for stage 2 if you can somehow make them "smart casual" - can you cut them neatly and tie them back neatly? CTC gives the term "smart casual" as an option for dress code in the stage 2 invitation.
For stage three, i might be tempted to keep them as well, surely they want people with personality / induviduality! And if you say you are prepared to cut them off if you get in, you might get the best of both worlds? They dont expect you to go to the expense of a class one medical before you are accepted -so they might take the view its not reasonable not to expect you to cut off your dreads before you get in.
i think dreads will be a no no if you get in though, have a look at
www.cadetpilot.com (not commercial just info is this ok?) shows some pilots out there -they all look neatly trimmed!
My 2p
CBE