Checked in here on 23 September. Arrived about 10am only one party in front of us.
We were able to check the weight of our baggage before we joined the line so would be able to shuffle things around if needed.
Remember Virgin don't pool the party baggage allowance, if one case is over then you are charged for the extra weight no matter if another bag is under weight.

If you DIY it's $10 if you have a Virgin Holiday package you get a complimentary voucher.