Hello Jack,
If Roger still owned the company he'd have probably given you some help personally. From what I hear the new owners are less than forthcoming with individual owners, having interests elsewhere in the school sector. So this leaves you with the task of locating a tutor who happens to own a VB. Two that spring to mind are Tony Walton (Suffolk), Tracy Owen (Cheshire), but I'm certain there are many more.
Is it the machine itself that you require tuition for, or turning? I don't quite understand why the machine should present use problems. Aside from the odd faceplate fixings and the sliding support arm I can't think of anything about it that would present you with problems.