Collins Concise English Dictionary © HarperCollins Publishers::
West Lothian question n - Brit the apparent inconsistency that members of parliament who represent Scottish constituencies are eligible to vote at Westminster on matters that relate only to England, whereas members of parliament from English constituencies are not eligible to vote on Scottish matters
Etymology: 20th Century: because the issue was first raised by the Scottish politican Tam Dalyell (born 1932) at the time when he was MP for West Lothian