Thank you again.
Well, that depends on what you mean by 'ever'. I did wonder if I should add caveats to the clip, but decided just to show that all can be independently controlled. (That also means that they can be left 'off', so it is up to the user to decide which to illuminate).
The glib answer would be 'Yes if it's a Dapol model' because that's how they have set up the 'rear' shunting lights to operate.
A more considered answer would still be, yes.
The pertinent BR Rule on lights for shunters and station pilots was that there should be one red and one white lamp at each end concurrently when visibility demands (I've paraphrased heavily).
The rule did not specify (in any copy I've seen) which colour should be over which buffer. (The Dapol arrangement has the reds and whites at opposing diagonal corners).
It was common practice, if not a rule, that the side closer to the main running lines should display a white lamp, the other side being red. Given that although the relationshp between the 'yard' and running lines may differ between locations, at each location they will remain the same. If the shunter/pilot is turned, the new orientation will mean that red lamps are now closer to the runnng lines so the lamp colours would have been swapped to compensate for this.
Therefore, it is likely that a red aspect could be either on the left or right of a loco during shunting depending upon the orientation and proximity of running lines.
For normal line running, it would normally only be red aspect to the left at the rear when light engine, but since the primary duty was shunting, red lamps were required on both sides so the correct selection could be made.
The purpose of the YT clip was to illustrate what would be physically possible, not what was statutory, customary or likely. An 08 pulling the Royal Train on the main line is very unlikely, but (at least until many 08s 'lost' some of their lamps in later life) it would have been possible to display 4 white lamps.
Kind regards,
Paul