Will SVA affect you?
Generally, your vehicle will need to be approved under the SVA scheme and issued with a Minister's Approval Certificate (MAC) if it is up to 10 years old from the date of manufacture and is not covered by either an EC or national type approval (British or similar national approval from another European Economic Area Member State).
Standard SVA only will be applied to the following:

• a left hand drive vehicle
• a personally imported vehicle 5
• an amateur built vehicle
• a vehicle manufactured in very low volume
• a vehicle manufactured using parts of a registered vehicle (for manufacturers only)
• a rebuilt vehicle (mandatory if first licensing and registration required)
• a motor caravan (optional)
• an ambulance (optional)
• a hearse
• an armoured vehicle

The above categories are defined in Appendix 1.
Enhanced SVAwill be required in addition to the Standard SVA in all other cases.
NOTE If you purchase a vehicle that has no identity, or have a vehicle that's identity has been removed by the DVLA and in either case another identification number issued, the vehicle is likely to require an Enhanced SVA.

From: http://www.dft.gov.uk/pgr/roads/vehi...e?page=1#a1002