I believe, although don't quote me that D14 was the only one left with nose doors in 1967.
I seem to recall researching this a year or so back as I wanted one with nose doors and my period is 1967ish and the others had been converted to class 46 style boxes.
I may of course be wrong so please don't take it as gospel, but I recall picking this one for my subject. I also believe that this one is the only one of the nose door versions to be "preserved".....
Please correct me if I am, (probably), wrong.
Cheers.
Sean.