I will be CO codeshare on VS metal Upper class next month IAD-LHR.

Looks like CO tickets have a small piece of the 747, and an even smaller piece of the340.

ACHK 789 in the 747, and ACDGHK 234 on the 340, more or less, a total of 10 seats on each.

Are any of these seats to be avoided? Are any preferred?