If your friend isn't cramming bags of noxious waste into an already overflowing bin that's only emptied once in a blue moon, then I don't see the problem, OP.
Maybe I should just get out more, but I find threads like this fascinating. Several posters seem certain that because x happens where they live, then that must be the case everywhere.
Others, of course, have pointed out that practices vary across the UK. (I know there have also been a few posts from non-UK residents.)
I've lived in the same town in south-east England for 30 years. When recycling first became a thing, we were asked to put our general waste into black bags inside black dustbins. Recyclable stuff was to be put into different bags of different colours (e.g. paper and cardboard in orange bags; glass in clear bags). All of these were collected weekly.
Later, people on my street were asked to put ALL recyclables loose into green wheelie bins - except for glass, which was now to go into black boxes. These were all collected fortnightly.
I moved three years ago, but I'm still in the same town. On this street, we have weekly collections of household waste (in black bags) and recyclable stuff (all mixed together inside pink bags). But my old neighbours, just a few streets away, tell me that their system is still as it was when I lived there.
(And by the way, I don't know of any part of this town where food waste is collected by the council.)
Is it any wonder that people get confused?