Snakes & Ladders 1-50 Large Half Solid
https://www.thermoplastic-markings.co.uk/shop/tmg003-50lh-snakes-ladders-1-50-large-half-solid-2008
https://www.thermoplastic-markings.co.uk/web/image/product.template/2008/image_1920?unique=99ccafe
Internal Reference:
TMG003-50LH