Yep the Y plater was mine and built up from new parts. Not heard about the museum story one?
Pretty sure the very first actual pre production car was on a B plate and is shown on the homologation paperwork for the 3dr. Will see if I can find a pic
Production cars were started in mid 86 and finished at the end of Dec 86 so the Genk plant could be stripped down ready to start making Mk2 sierra's and saffs. They sold well but some were held back and made it to e platers and the odd one even later.