" 
 :It was built to Lot no. 30826 Derby 1970 on the u/f of CK Sc15170. It's dealt with in the definitive work on Mark 1 coaches: 
 :* 
 :so if Parkin says it's Mk 1, I guess it must be. He also implies that the original body ends were retained. I often saw that van at Banbury in the early 1980s, on a daily parcels working to Coventry, and noted the passenger-coach style bow ends and Buckeye couplers.   "