I did a flight from Luxembourg to Heathrow. Everything started OK, but once I reached initial cruise I needed to step up from FL330 to FL340. I pressed h + 1 but nothing happened. I tried C/S/T a few times but again nothing. After I reached where I thought TOD was I had nothing at all so began the descent and landed. I did press C/S/W and got the warp page. At no time did I get "nag" or instruction from PF3 apart from 1 traffic advisory when near Heathrow. Nothing after landing either.
Not sure what happened, or what I could have done to try to prompt a response.