Pre CD I used to eat a lot of quorn...not a strict veggie, I eat chicken and fish, but most of our meals are more veggie than meaty.
You can buy quorn pieces, but to be honest, I'd just stick to the chicken pieces, as quorn is pretty bland without a sauce of some kind. Also, if you overcook it it's pretty grim. Not sure how it would be cold either, whereas we all know cold chicken is yum.
The escalopes are lush, but out of bounds, as someone else said, they are covered in breadcrumbs and have other stuff in them (the broccoli and cheddar ones, mmm, *droooooooooool!*)
The sausages...icky in my opinion, but again, don't know if they'd be acceptable for CD.
I know that when I get to AAM or SS+ I will be doing chicken/tuna rather than quorn.