Some of mine (which I swear are breeding behind the shed) are brown outside with black inners, which might be even more confusing for the recycling machines... don't know the answer to your question, I'm afraid, @stewyfizz.
Since 2019 I've lived in east Clare, in the west of Ireland.
My Granma had a milkman who ladled out the milk from the churns in the back of his van, into jugs. Some things were best left! But of course in those days the wife stayed at home. She had nine kids so never went out to work! Can you imagine nowadays having to stay in on milkman day!!
The whole truth is an instrument that can only be played by an expert.
That's part of the reason our local GC have stopped their scheme where we could take pots back ... they have more financially productive things they can do with the space that had been devoted to the 'pot bin' which was quite large. Also, as I said, the commercial recycling company stopped taking them as it was uneconomic for them.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
If the GC took them to the tip they would get charged at trade waste rates. Of course they don’t want to take them back. Its up to us, the consumer not to buy the stuff in the first place.
Gardening on the wild, windy west side of Dartmoor.
Posts
https://www.recyclenow.com/what-to-do-with/plastic-plant-pots
"You don't stop gardening because you get old, you get old because you stop gardening." - The Hampshire Hog
Best thing is not to buy in the first place.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Its up to us, the consumer not to buy the stuff in the first place.