The Congleton Pride / Cheshire Police hate crime poster is A4 (210x297mm). There are two options depending on how this is going to be printed:
poster-basic-print.pdf is a version for basic printing onto pre-cut A4 paper. The green background will simply go as close to the edge of the paper as the printer used is capable of.
poster-bleed-cropmarks.pdf is for printing on larger paper then cutting down to A4. It includes 3mm of bleed and a further 3mm of cropmarks on all sides, making 222x309mm in total.