There is a growing trend now to put fish and chips in polystyrene boxes....not sure if this keeps them hotter for longer (they used to be wrapped up in paper - probably still are in certain places).That makes absolutely no sense to me. But then different countries, different ideas.
I cannot imagine having to take fish and chips home to eat them.
That to me would lead to soggy fish and cold chips. Or how do you keep the food hot?
Chips (Uk) are only good if they are hot.
I agree with you that it is problematic to take away in terms of keeping it hot for long enough. I guess their home is nearby and they drive. It is not odd to see people eating chips as they are walking...especially after pubs close!