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Insurance0 min ago
No best answer has yet been selected by long john. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Oooh 6 months that might be a bit optimistic - worth checking though I heard of someone first registerred in November that qualified
You need a heritage certificate
http://www.heritage-motor-centre.co.uk/archive/certificate/default.htm
The historic vehical tax exemption is based on the date of manufacture not the date of first registration.
Since it is quite possible for a vehicle to have been sitting around on a forecourt for some time after manufacture it's quite possible for a vehicle to be registerred after the cut off date but still to qualify.
However in order to prove qualification you need documentary evidence of the car's date of manufacture. Gaydon keep records for many of the BMC marks and you can pay them for a "heritage certificate" which you can use to get the tax status of your car changed.
As pointed out in the question, if it was manufactured prior to 1973 it qualifies for exemption from road tax.