Steph, afraid not, no brass frames on LNER side windows, all wood I'm afraid. certainly the classes I've researched so far.
V2
A4
There is a brass rim to hold the glass in on the inside, but I drew the line at that insanity
The only brass glazing surround I've found to date is the front spectacle plate.
On the A4 several were cleaned up but quickly tarnished and some seem to be painted in loco colour (I'm talking BR here) or badly tarnished, however the other classes seem on the whole to be painted loco colour unless bulled up for some special occasion.
The cab etch does have the spectacle plate in NS which is incorrect, I don't have any brass etches worked up for other projects at the moment, when I do I'll squeeze some on, otherwise it'll cost a fortune just for the cab spectacle plates. that's the biggest problem when working in NS, for some parts you need to run a special etch just for the little bits of brass you need, unless your modeling the WR