Good news for and Evo owners,the DVLA has announced that smaller Character sized Number Plates, similar to those used on motorbikes,are now permitted on certain imported vehicles.
Amendments to the road vehicle regulations permit smaller registration plates to be used on imported cars from the far east and the states,About Time

Display of Vehicle Registration Marks on Imported Vehicles
(which have a restricted space for a standard sized number plate)
The Road Vehicles (Display of Registration Marks) (Amendment) Regulations 2002 SI No. 2687 came into force on the 22 November 2002.

These amendment regulations introduce a new regulation 14A, making special provision in relation to the size and spacing of characters in the registration mark of some imported vehicles. This provision only applies to vehicles imported into the United Kingdom which do not have European Community Whole Vehicle Type Approval; and are so constructed that the area available for the fixing of the registration plate precludes the display on the plate of a registration mark in conformity with the requirements of regulation 14.

Therefore, the new regulations permits Imported Vehicles (Which have a restricted space for a standard sized plate - as described above) the provision to display smaller plates