My warranty has expired but I would like to request some ‘good will’ from isuzu uk.

In all circumstances you will need to present the vehicle to an Isuzu dealer with all supporting documentation such as service history and parts invoices if you have them. You will be required to authorise them to investigate the cause of your concern. If your claim for ‘good will’ is denied the cost of diagnosis and or repairs will be chargeable to you.