I think if it’s a wet lease yes, but to state once more, you can upgrade any European flight from any RBD, or fare type, so even the cheapest K Light or O Saver on LOT and it needs one voucher. Verify on the award flight finder if there are C seats for miles, it will probably clear instantly.

As it includes LOT, it probably includes LG and OU.

The website is so rubbish it’s hard to know that stuff.

I made the mistake of listening to know it all lobotomy crew at a call centre, corrected by a nice German grandma, once I realised they were talking crap I was able to get what I wanted.