There are no fines, they are invoices, bills, for parking. No need for any shame (real or imagined).
If work employed creative they certainly should be able to tell their agent to cancel.
The extra £70 'debt collection' costs (which aren't actually incurred) are routinely thrown out by the courts, thus near enough halving your total liability.
1/ You cannot appeal the CCJ, you can apply for a set aside, cost is £270 or £100 if you agree an uncontested set aside with the claimant (which is NOT QDR but creative, you are putting the cart before the horse) where you agree to pay the judgement - however doing so would put you in a weakened position with respect to defending the others.
2/ Creative won't even consider an appeal now and never accept any regardless, there is no £100 in it for them. What you wrote is no defence anyway.
3/ No, save your money, you'll get experienced advice here for free.
You glossed over the WHY you have the invoices "there was a mistake adding my details to the car reg database", who's mistake? Yours or the landowner's?
NEVER call, EVER, in writing ALWAYS.