About those prepaid catering vouchers, DON'T BUY THEM. Each flight I have recently flown involved a total mess with redeeming those vouchers. Pax coming back from the toilets were lining up while the trolley blocked the aisle. The crew have never seen them before and don't know what to do with them. They appear to be looking for some sort of code to input, but there is none on the boarding pass, paper or digital (I had both versions with me). The whole thing took rather a lot of time and possibly annoyed other passengers. But in the end almost nobody bought anything off that trolley.