As BRC stated you are in breach of contract with the service station operator/owner of the land that you parked on. They require and are entitled to compensation for breach of contract, to get compensated they have to take you to court. Now you can risk not paying, taken to court and then have costs added. They no longer have to prove you were driving as the registered keeper of the vehicle you are responsible for the vehicle (that's the change).
The solution is easy, before they spend a lot of time (thus money) on handing over to debt collection agency and then taking you to court, send a settlement letter without prejudice offering compensation that you deem appropriate and enclose a cheque for said amount (registered post obviously). The amount of compensation is there claim, yours is a settlement, only the court can decide whether there is a case and if the amount they ask is reasonable, making the offer of settlement means that if they do go to court, you have been reasonable and tried to settle. After all there was no loss in revenue
As for the settlement figure, what do you feel is reasonable?
The solution is easy, before they spend a lot of time (thus money) on handing over to debt collection agency and then taking you to court, send a settlement letter without prejudice offering compensation that you deem appropriate and enclose a cheque for said amount (registered post obviously). The amount of compensation is there claim, yours is a settlement, only the court can decide whether there is a case and if the amount they ask is reasonable, making the offer of settlement means that if they do go to court, you have been reasonable and tried to settle. After all there was no loss in revenue
As for the settlement figure, what do you feel is reasonable?