Hi N,
You ask , 'are the DWP allowed to use as evidence from 2013?' and the simple answer is 'yes'. If the assessment is no longer accurate you must make this clear.
I refer you to your previous post and the advice you were given there as this is still valid
www.benefitsandwork.co.uk/forum?view=topic&catid=10&id=103546 this points you to our resources for DLA appeals.
Your job now is to provide a succinct appeal submission, outlining why and how you qualify for DLA.