We applied for upgrade Thursday 28 July, 2 weeks before our travel and 8 weeks after application. I thought I’d never get a response but when I spoke to my MP they said the upgrade would go through but I have to wait until 48 hours before the flight. Very stressful wait, but we did get the call yesterday – 3 days before we fly. Ours was in Liverpool as well and they apparently work according to travel date so you just need to confirm the upgrade will go through and wait for the call. After the call we had confirmation it was printed within an hour.