I immediately assumed the coaches were E40, which were quite common in the far west country, but D16 looks like a reasonable fit. I'd go with an E40 assumption though, judging the spacing of the 1st compartment and the other compartments. (D16 not having a 1st compartment, of course.)
Either way, the date is post-1895, which is rather late for an 850 loco to still have its Wolverhampton chimney and toolbox.