FlyerCO... You can fly LGW > LAS on VS...? Despite the seasonal MAN > LAS ending soon, there is still wide open award availability on next years for both MAN and LGW. I was searching for UC award availability just the other day, I actually found 5 UC seats available on one of the MAN flights!!

It's certainly an IT glitch. No reason you shouldn't be able to use FC miles for any VS metal routes.