A very random question but I'm sure some FTers will know the answer @:-)

I want to make an Aeropress on an upcoming flight and was wondering what the actual water temperature in BA's kettles is. I think water will boil at around 90 C as opposed to 100 C due to the cabin pressure - but is water in the kettles almost boiling or just kept hot? I typically use 85 C for Aeropress (wondering if this should be adjusted downwards too)...

It's a 777-200 from LGW in case helpful (I assume the answer may be slightly different for BA's 787s due to the different cabin pressure!).