I'm sure it used to say you could have a single line plate, provided the letters were the correct height / width and spaced correctly. [URL]http://www.dvla.gov.uk/vehicles/regmarks/reg_marks_current_requirements.htm#motorcycles[/URL] This thread hints at it [URL]http://groups.google.co.uk/groups?hl=en&lr=&ie=UTF-8&safe=off&threadm=Xns939A7D1999766ringading%40130.133.1.4&rnum=9&prev=/groups%3Fq%3Dplate%2Buk.rec.motorcycles%26hl%3Den%26lr%3D%26ie%3DUTF-8%26safe%3Doff%26selm%3DXns939A7D1999766ringading%2540130.133.1.4%26rnum%3D9[/URL]