After receiving so many comments, advice, support and a little ridicule, I thought that it would be appropriate to let you know what became of my Landie.
I’m not going to go into lots of detail (I’d be here all day). Following extensive research using the bulkhead chassis plate, registration etched into the windows and major component serial numbers and then with the support and influence of the Series 2 clubs VRO. Finally to my surprise and relief DVLA were persuaded as to the vehicles correct 1976 Series 3 identity, she was permitted to revert back to this original identity and regain her original registration.
The new V5 is now with me and work has resumed to get her back on the road this summer. Its uncanny, but it turns out she was first registered on the day that my wife was born!
So there is light at the end of the tunnel and sometimes honesty does prevail.
Best wishes to all.
Andy