How does this Depreciation info compare with the Insurers 'Guaranteed Value'? spread over the 3 years?

Our first 4/4 traded in after 1 year for 0% reduction.

The Roadster Guaranteed Value was reduced from £42.5k to £39k after 3 years? Mileage does not come into that one.

With a Morgan how are the 'Extras' over the 'Basic Price' treated when they are making these 'Depreciation' and Guaranteed Value' valuations?

The Roadster 100 'extras' at purchase were worth about £3800. idea


http://franks4x4-solograndetour.blogspot.co.uk/
Combat Stress-http://www.justgiving.com/Roadster100