ISO 12233 resolution chart
Thank you all.
I already have the pdf version, and yesterday was stitching together a large version from A4 pages. It was driving me nuts getting them to align perfectly, I used super sticky double sided sellotape rather than tape that can be reapplied so once it was down and I was a mm or two out I was stuck with it. It will be slightly wonky out of align version I'll use tomorrow. I also made a smaller version to A3 size, my printer didn't resolve all the wedges, might be enough for 1080p.