Products › Modern day Whistle board Modern day Whistle board £7.00 A complete modern day "Whistle" sign. Can be mounted to any flat surface. Approx size 50mm x 50mm. A complete modern day "Whistle" sign. Can be mounted to any flat surface. Approx size 50mm x 50mm. Add To Cart Added! You Might Also Like Quick View Eastern region style buffer stop lamp £3.00 Quick View Modern day speed sign £7.00 Quick View Replica Shed plates £7.50 Quick View Limited clearance sign £7.00 Quick View Custom stop boards £7.00