Welcome to the Community @Shepp
It is true that different councils have different restrictions on what they will take for recycling and there are often differences even with neighbouring councils.
This site from what appears to be an activist organisation tells it like it is…the key claim is
- The plastic recycling number system actually serves no purpose: the consumer cannot do much with it and the waste separators do not use it. Clicking through includes the ‘why’.
and this site explains what the triangles are and are not.
https://recyclingnearyou.com.au/nationalrecyclingweek/mythbusters/3
The bottom line is the triangles are information for consumers about the plastic, not about recycling per se.
