You could try something like:
http://www.quorn.co.uk/CMSPage.aspx?ssbid=67&pid=46[/URL" target="_blank">

But I have no idea about what it tastes like (I'm vegan and I'm pretty sure the egg in it was the reason i never tried it). It depends a bit on what sort of vegetarians they are. Are they going to be put off by a meat-like roast? There are other options but this type of thing is probably what you can get off-the shelf in the UK. Don't know if tofurky is available in the UK, I think its not bad, but opinions vary.

Don't forget the cranberry sauce! I'm not a veggie, but with all the amazing sides (already posted), I can totally skip the turkey each year!! IMHO, just leave it out and make a variety of "trimmings."

As others have said, that's an amazing gesture for you guys to do. She's very lucky to have such a thoughtful family. This is going to be my fourth consecutive year away from the States for Thanksgiving. It's gotta be the hardest holiday for me to miss.

I don't have a lental/nut recipe........but for the rest of your questions. With corn, just heat it up slowing in a pot on the stove or in a glass container iin the microwave.
Definately fresh cranberries. Just follow the directions on the package, but if there isn't any, just bring them to a boil with a cup of water and a 1/2 c sugar and let them cook, reducing the heat, until they are the consistency that you want.
Any bread with the meal would be great......i usually have something warm that i can heat up in the oven. I only buy these at Christmas and Thanksgiving and Easter.....they are the Heat and Serve buns. They are white bread......you put a little butter on them and heat them up for 10 minutes or so. Yummy. I don't like or eat white bread, but i like those, for whatever reason...

Sounds like every family has its own traditional stuff. For us, if you just skip the turkey, you'd have white mashed potatoes, baked sweet potatoes, creamed onions, stuffing, green beans and cranberry sauce. My family would take great offense at serving bread or corn!!! (Although clearly corn was at the first Thanksgiving...) And of course celery stuffed with bleu cheese with olives as garnish for a bit of a cold, crunchy palate cleanser... We have veggie relatives and they just skip the turkey and eat everything else. And for dessert - pie..... lots of pie. Apple, mince, pecan, all served with vanilla ice cream. Apple cider to drink (hard or soft, depending on age).

Here's a lentil loaf recipe that is tasty:

http://vegweb.com/index.php?topic=7685.0[/URL" target="_blank">

Also, here's a link you may find helpful:

http://vegweb.com/index.php?topic=19034.0[/URL" target="_blank">

Good luck and I'm sure your brother and his wife will appreciate your thoughtfulness

Many people have mentioned mashed potatoes, which certainly are a Thanksgiving custom, but don't forget the gravy!! My husband grew up on green bean casserole which is basically green beans, cream of mushroom soup and canned dried fried onions. You can find the recipe at www.campbells.com.[/URL" target="_blank"> I don't care for it, but it's part of his Thanksgiving tradition.

In terms of a lentil loaf. You might want to search this site for ideas: http://www.veganlunchbox.com/loaf_studio.html.[/URL" target="_blank">

I vaguely remember somebody posting on CR at one point in time about dinner in a pumpkin. It might be worth researching.

Good Luck!

My typical vegetarian (vegan) thanksgiving (been doing it for years).
No need for a turkey substitute. Most of them don't taste so good anyway. Products like quorn are highly processed and contain animal ingredients and may be distateful to many vegetarians.
The most important thing for a proper thanksgiving dinner is abundance. ... or the three F's: food, family, football.
1. Pumpkin soup
2. Baked winter squash with spices and a little honey or brown sugar.
3. Yam or sweet potato casserole. Our favorite has pecans and rum.
4. Mashed potatoes with garlic
5. Fresh cranberry sauce (it's fun to make)
6. Chestnut dressing
7. Green salad with dried cranberries and nuts
8. Some green vegetable, perhaps baked asparagus with a vinaigrette
9. Pie: always a plain apple, plus an apple-pear or apple-cranberry, then more pie, like pecan pie, sweet potato pie, or pumpkin pie.