Andy my MY2000 D2 came with amber marker lights as standard and has never failed an MOT yet. even though LR can be real tw@ts I don't think even they would build a car that would fail an MOT as standard.
Also, as I found out at an MOT donkey's years ago, you can drive a car with yellow headlights, but both must be yellow, I failed cos I had one of each and the inspector told me all this. They must simply match.
From the Gov.uk manual
"The colour of the light headlamps emit must be one of the following:
- white
- predominantly white with blue tinge
- yellow"
See
https://www.gov.uk/guidance/mot-ins...ectors-and-electrical-equipment#section-4-1-1
But funnily I cannot find anything that says that amber markers are OK, probably because they only work when the sidelights/headlights are on, but that IS well weird.