Another site for Coleophora follicularis was found - just look out for eating damage marks on the upperside of hemp agrimony leaves and then check for the larval cases. Photo below:
Another Coleophora to search for (on alder and birch) is the very common C. serratella. Certainly one to look out for in your local patch. Photo of larval case (this one on alder) and presumed leaf damage below:
Finally, I found the macro caterpillar shown below on an flag iris leaf. It should be easy and I`m sure that I know it, but I`m stumped - perhaps ruby carpet is a possibility, though I`m unsure. Any suggestions please?