Postal Rates

The free bookkeeping software CD and the information 'leaflet' on CD weighs about 50 grams, so whether the Post Office classifies it as a "letter" or as a "large letter" depends entirely upon the envelope that you send us to return to you.

To be a "letter" it must be slim enough to fit the Post Office template (currently 240 x 165 x 5 mm), and weigh under 100 grams.

Link to Post Office.co.uk.