Apologies, I meant Regulation 18, silly me !!
No the driver has no role in the process, it is the owner as recorded on the V5C Registration Crtificate for the car. HOwever, you can authorise a person to act for you when submitting representations, or when attending a hearing at London Tribunals, but if the case fails, payment remains with the vehicle keeper as per the V5C.
Just to clarify...
Take it to the LT and win, happy days!
Take it to the LT and lose, does that mean the amount of the fine is £160 and that is all or are there other fees to pay too?
Only the full PCN penlty is payable if one loses. There are no additional costs whatever.
As for attendance at the hearing, all you have to do is to arrange a date when you are back in the UK. Adjudications are not courts, it is much more informal, with just you and the adjudicator normally, because the councils very rarely bother attending. The adjudicator will have read your reps and may ask questions, then make his decision. It's that simple.