Currently I’m working on a free service to build large-format maps with an user specified projection. A map with EPSG:27700 projection and British national grid (similar to Ordnance Survey) seems to be a good test candidate. Unfortunately I’m not familiar with British maps. Could someone here make a quality check (projection, grid, labels, …)?
Download: https://1drv.ms/u/s!Aia-njhe_KN5gQAV9DnCc7qgga6a
Map size: 841x841mm
Resolution: 300ppi
Grid source: https://github.com/charlesroper/OSGB_Grids
Magnetic angle calculation: http://www.geomag.bgs.ac.uk/data_service/models_compass/gma_calc.html
PS: The download link is only valid for a limited time.