David - we're not far down the M56 from you at Helsby. As others have said, get her in the car and even try driving it. After lusting after a Morgan since I was 12 and although I knew my wife was into cars I did mot really think she would get it about Morgans until she drove a friend's. She's as nuts about them now as I am.
Also, you're not just buying a Morgan. You're getting a new way of life. We have met some great people and made new friends and have such great fun going out as a group of several Morgans.
Go on - just buy it! Life's too short and come out and join us on some fabulous runs!