How much of a 40 year car must exist to qualify it as being 40 years old?

How much of a 40 year car must exist to qualify it as being 40 years old and benefit from zero road tax and no MoT?

Why is my Fiat X1/9 not tax exempt?

I own a Fiat X19 which is SORN at the moment while I make repairs. The car was made in 1984 but I was told by the DVLA that since it was not registered in this country until 1989 ( it was used in Jersey...

Is it legal to take a car out of long term storage and drive it home to be garaged without tax or SORN?

If you take a car out of long term storage and drive it home to be garaged without tax or SORN, what would happen if the police stopped you? The car is insured.

When does my 1979 BSA become an historic vehicle?

My BSA was registered in October 1979. When does it become eligible for historic status as far as DVLA is concerned? Their website suggests they have only got up to January 1979.