Hi Dave
Its another numbering conundrum!!!
That Brush type 4 in J608 has fixed 3 part radiator grilles, looks like a Stones boiler and seems to be VB only - as built D1819 was serck rad grilles and dual brakes, no boiler
D1619 as built fits the above profile and was a WCML loco April 66- Feb 67 - what do you think?
Phil