There is absolutely no evidence of the driver or anyone else for that matter, having left the site. Irrespective of whether the appeal is from the Keeper or the driver, this will never get as far as a hearing.
The onus is on the creditor to prove that the driver breached a term or condition of parking. Do not do their job for them. Unless that can evidence that the driver left the site, they cannot possibly win.
It is a pity that you identified as the driver when you could simply have appealed as the Keeper and declined to identify the driver, therefore requiring G24 to figure out, assuming they even had any evidential photos of someone actually leaving the "site", of who that person actually is.
Don't bother with an IAS appeal. Simply wait until you receive a Letter of Claim (LoC). You can safely ignore all debt recovery letters. They are powerless to actually do anything. Simply ignore anything except an LoC or a an actual N1SDT Claim Form from the CNCB.
If/when you do receive either of those two things, come back and show us. In the meantime, just get on wit your life and stop worrying about this. You won't be paying a penny to G24.