We have exactly the same colour combination Richard :-)
Mine is 889348 24 Oct '63.
My Door casing originally looked like this:
Looking at the clips:
it seems I have the earlier style chrome trim,
but I guess I could have also the front chrome edge piece.
I found this car: 880472 OTS built 1st Nov '63 which clearly has early style edge trim and the forward chrome edge trim as well:
So, there may have been 2 changes:
Front sloped edge of the door casing:
up to at least Dec '62 the edge was trimmed with vinyl piping
at least from March '63 the edge was trimmed in chrome piece fitted on the sloped edge.
at lease from April '64 the edge was trimmed with chrome piece fitted to the door and the casing slid under it. This finally solved the problem of upper casing curvature.
Main upper door trim:
up to Nov '63 the chrome piece was of the early type, fitted with small clips.
from Nov '63 the chrome piece was similar to the late style sloped edge trim, holding the upper edge of the casing to the door body.
Trim panel fitted on the hinge face of the door, retained by the door light switch striker:
- fitted from June '63
I checked Haddock, the only change documented is of the extra trim panel.
Tadek