With our Premier service you can enjoy much-needed flexibility when mailing letters and large letters. Whistl offers you convenient pick up times with the benefit of the day-definite UK wide delivery.

Premier is the ideal service if you are looking to make great savings on your mailing. Pre-sort your letters and large letters and a member of our team will collect them at a time to suit you, ensuring they are processed to full Royal Mail specification. As a Premier customer you'll also benefit from the added security of proof of delivery to the Royal Mail.

How it works

Key Information

Key Information

Category Machineability Formats Service Level Destination Min volume items per collection Max weight






Large letters 





Letters: 100g

Large letters: 750g

*minimum volume will vary depending on service, please speak to a Whistl Post advisor for more information.


  • Minimum volume of 4000 to 10,000 items per customer ID, per collection, per day
  • Mail must be sorted according to format and weight band
  • Every item must carry a Whistl approved indicia and a valid UK return address
  • A minimum of 90% of mailing items must be fully and accurately addressed and postcoded in accordance with the Royal Mail's Postcode Address File




Min Length (mm) Max Length (mm) Min Height (mm) Max Height (mm) Min  Thickness (mm) Max Thickness (mm) Max Weight (g)
100 *Manual* 240 70 *Manual* 165 0.25 5 100


Large Letters

Min Length (mm) Max Length (mm) Min Height (mm) Max Height (mm) Min Thickness (mm) Max Thickness (mm) Max Weight (g)
100 *Manual* 353 70 *Manual* 250 0.25 25 750

The weights and dimensions stated above differ for each respective machine level, please speak with your Whistl customer service specialist or consult the customer guide for full details.


  • Benefit from flexible pick up time
  • Impeccable customer service from your dedicated account manager
  • Ultra-competitive pricing
  • The more you pre-sort the more you save
  • Improved efficiency through innovation
  • Feel secure with our proof of delivery to the Royal Mail


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