Flew the A350-1000 Sao Paolo to LHR on 09/10 Jan and despite there being an announcement that Wi-Fi would be available on 12hr flight.... The network never appeared. BA offered me 10k Avios, which I thought was rather pathetic. I was in business and was hoping to catch up on a bunch of work during the flight. Of course had they announced that the Wi-Fi wasn't working during boarding, I could have pre-downloaded a bunch of things to do. Live and learn with BA! On my trip to Rio a few weeks prior, on a tired old 777, whilst flying economy, the Wi-Fi worked like a charm the entire flight. Murphy's Law I suppose.