MORRIS J TYPE

This week I was contacted by a friend who is involved demolition " What's that old van you got mate,I found some books on a site we just dun Morris I think " he dropped them round on Saturday morning . A 'J' Type hand book a JB Workshop manual and similar for a JU 250
Written inside both the 'J'type manual and handbook are
Eng.No. BP15JB/4/421 chassis No. JB/MR36543
anyone recognize these numbers ,if so I would be happy to do some kind of deal if you want to reunite them with your vehicle. I am doing some research into the joinery works that was demolished to find details of the company who once owned the JB Van'.