Hi,
I not sure if your sister will have any luck in the U.K. because International Motors are the main importer of Isuzus and they refuse to recognise the VX in fact I have politely contacted them on several occasions and come to the conclusion they are very very unhelpful in fact I have such a bee in my bonnet about thier attitude that I am compiling a list of parts which are not manufactured by Isuzu in a feeble attempt to boycott Isuzu products in the U.K. So if you need brake components check out the EBC website, oil and air filters are made by a number of other manufacturers I think the exhaust made by Tone Monday will probably fit the Japanesse spec models. I think sam here in the U.K. has a manual but it is of course in Japanesse. Hope this helpsif you need the cross reference numbers for the filters I can e-mail you them.
Best regards
David Wiltshire