I've heard different opinions on this, NoMercy, so don't be too despairing. Some people say that as long as it's legible it will be accepted, others that any alteration will render it void.
As these are totally opposite opinions, I tend to believe the one that suits me, ie it's OK to correct.
otherwise I, too, would have wasted a huge amount of money in postage!
:-))
Iv'e sent mine in sometimes with a correction and have never had any indication that it wouldn/t be accepted. I can't see that it would make any difference as long as it is still clear.
like filibuster I always do mine in pencil first and then ink it over.