Motorcycles registered on or after 1 September 2001 must display a two-line number plate number plate. Motorcycles registered prior to the 1 September 2001 may display a three-line plate, but one-line plates are illegal, irrespective of the date of registration of the motorcycle.
The law states that,
You must not alter, rearrange or misrepresent the letters or numbers
Characters must not be moved from one group to the other (e.g. A242 ABC must not be displayed as A242A BC).
Offences may result in any or all of the following:
A fine of up to ?1,000
The registration mark may be WITHDRAWN
The vehicle may FAIL the MOT test
Sensible answer !!!!!!!!