No you need the originals. You can send an alternate to the passport (Birth cert I think) or a copy of the Passport signed/ auth'ed by your school.
But call the CAA PLD for advice. THis is the one thing that does not need a credit card number in advance (its already built into their cost model)
... and watch out for all those valuable docs coming back in the torn CAA brown paper parcel afterwards ...
h-r