I had 4 e-vouchers expiring at the end of the month. I only have shorthaul LHG flights currently booked but followed the steps described above. Upgrades for 3 out of 4 flights were initially waitlisted but cleared within 2-5 minutes. Better than 3/4 e-vouchers down the drain. The 3 upgraded flights currently show P0, but the only flight which could not be upgraded is P9. The flight in question is in mid-April. I might try again later.