New User... Lots of questions :)

So aren't you lucky for reading this...
Little background -- Taking my wife to London in late June/early July; 280613-070713 is what my current thinking is. She has never been internationally while it has been 20 years since I've been to London. Neither of us have flown any of Virgin airlines.
She isn't the world's best flyer so I would like to "reward" her for taking such a long trip with a nicer seat (at least to London if not R/T).
Only small issue is that we live in Atlanta (which isn't served by VS or VX). In addition, due to family reasons, we would prefer to fly out of Knoxville, TN.
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Having said all of that, my current thought is to fly to DC (DCA specifically) and then make my way to IAD for a VS flight.
I understand that VS offering a car service for Upper Class passengers. Is that on both ends on the flights? If so, is there any restrictions on where they will pick up (or when/timing)?
Is it worth getting a UC seat going from the East Coast? There is a large jump in price from a PE that I am tempted to just go that route East and the UC back home.
If I didn't go UC ... how difficult is it go between DCA & IAD (knowing that the DC Metro doesn't connect the two points)?
If I did fly into IAD from TYS ... I assume that I would need to get my bags and re-check them in, correct?
Anything else that I should think of?
And believe me, going another route/carrier is an option that I could consider. Right now, AA & UA are currently the cheapest for Coach... but I'm not sure if I like the timing (especially for AA).
Thanks,
Jeff

Little background -- Taking my wife to London in late June/early July; 280613-070713 is what my current thinking is. She has never been internationally while it has been 20 years since I've been to London. Neither of us have flown any of Virgin airlines.
She isn't the world's best flyer so I would like to "reward" her for taking such a long trip with a nicer seat (at least to London if not R/T).
Only small issue is that we live in Atlanta (which isn't served by VS or VX). In addition, due to family reasons, we would prefer to fly out of Knoxville, TN.
-----
Having said all of that, my current thought is to fly to DC (DCA specifically) and then make my way to IAD for a VS flight.
I understand that VS offering a car service for Upper Class passengers. Is that on both ends on the flights? If so, is there any restrictions on where they will pick up (or when/timing)?
Is it worth getting a UC seat going from the East Coast? There is a large jump in price from a PE that I am tempted to just go that route East and the UC back home.
If I didn't go UC ... how difficult is it go between DCA & IAD (knowing that the DC Metro doesn't connect the two points)?
If I did fly into IAD from TYS ... I assume that I would need to get my bags and re-check them in, correct?
Anything else that I should think of?

Thanks,
Jeff