Single packs contain either RED and BLUE or GREEN AND YELLOW colour coding. Please note: First-class orders received before 3PM are posted the same day. (According to Ofcom, 23.5% of first-class mail failed to arrive on time in the year to the end of March 2025). From June 2025, packs are £8.52 each, a rise of £1.23 (from £7.29) to meet an increase in print costs.