Originally Posted by
G-BOAC
Proactive Upgrades - but it's WT to WT+ only AFAIK (maybe ET to CE too but I don't recall reading about that here so far whereas WT to WT+ has been discussed several times).
My 50% miles sale LHR-KBP-LHR ET redemptions have all had upgrade to CE options in MMB at 150GBP each way.