Or has that compostable plastic already been considered?

[Hohofortherobbers]

If we need to stop using plastic bags and film wrapping etc for packaging, then why haven't we started using that degradable compost bag plastic we put food waste into instead? Should I be patenting this or is there a very good reason why not?

The National trust cups are “commercially compostable” which means they will only compost in the correct environment which is not a domestic compost bin. Won’t get anywhere hot enough.