If you mean the head drip on left hand casement - it hardly matters, it’s up in the air so hard to see from ground and protected by roof overhang.
I would say use plastic.
If you mean side trims, we’ll same thing.
only thing to bear in mind is plastic will go a different colour to the paint on windows over many years….but it’s only a small trim all the same
nice windows, looks like a nicely made and installed job….I imagine you are pleased.
conventional stormproof upvc would have looked awful. the big chunky sight lines would have ruined the look of the bays totally.
it would’ve been heresy putting in upvc in an Edwardian period house.
Flush timber alternative upvc would’ve looked ok but closer to timber price.