premise: Pendle is a constituency represented in the House of Commons of the UK Parliament since 2010 by Andrew Stephenson, a Conservative. The constituency was newly created for the 1983 General Election, being largely formed from the former Nelson and Colne Constituency.
hypothesis: Andrew Stephenson was born after 1983.
reason: The information didn't provide insight on Andrew Stephenson's birth date, but he could feasibly have been born before or after 1983.  The fact that 1983 may have caused the system difficulty.