FirstSort is a great tool for your local-centric business. Enjoy the freedom of sending high volumes of time-sensitive letters to addresses across selected areas of the UK at amazingly low prices. We'll sort your machinable letters and have them ready for delivery on the first working day after the day of collection.

FirstSort is ideal if you have time-sensitive letters destined for a specific locality and are looking to make significant savings of both time and money. This service is currently available in London, The Midlands, The North, The South West and Scotland.

Key Information

Key Information

Sortation Address quality Formats Service level Destination Min volume per day Max weight
Unsorted manual Machine readable Letters Next day Regional 250 100g



  • Standard envelope sizes DL and C5 only
  • Machineable items only, excluding: Polywrap, plastic or window envelopes without plastic film; enclosed inflexible objects such as coins, pens and keys; any item greater than 5mm in thickness and/or heavier than 100g
  • FirstSort mail is delivered to the destination address by Royal Mail
  • FirstSort letters will show a Whistl FirstSort indicia



Min Length (mm) Max Length (mm) Min Height (mm) Max Height (mm) Min Thickness (mm) Max Thickness (mm) Min Weight (g)
140 240 90 165 0.25 5 100


  • Next-day delivery within your chosen region
  • Flexible cost-effective service
  • Get help and advice from your personal account manager
  • Guaranteed lower cost rates than Royal Mail
  • Flexible service from our great regional teams
  • Proven high-performance service
  • Benefit from our state-of-the-art sortation technology


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