I'm flying with TUI in November with my two year old and the flight is nine hours long.
I've messaged them about their changing tables as my son is the size of a four year old and it won't be suitable for him unfortunately and they said due to health and safety there's no where else I can change him which that's fair enough - I'm planning on changing him on the seat, we will of course have wipes and will keep the area sanitary and clean and will keep his dignity by blocking the view so other passengers don't see this.
I think this is the only option really but if anyone else has any ideas I'd really appreciate it.