Pricing in Proportion

Pricing in Proportion is a Royal Mail postal price structure in the United Kingdom introduced on 21 August 2006. It is also used on the Isle of Man by Isle of Man Post, but not on the other island post networks Jersey Post and Guernsey Post. The system has four bands - letter, large letter, small packet and packet. The price of mail is based only on the size of the item as well as weight with no price differentiation between locations within th UK. It was started by the Royal Mail to make the pricing of mail reflect the actual cost of postage.
Royal Mail originally claimed that 80% of items would be unaffected by the change which would also be "revenue neutral". This was then revised down to 70% (i.e. 30% cost more or less than before).
The System
Letter
The size is a piece of mail that has a maximum length of 240 mm (9.45"), a width of 165 mm (6.50") and a thickness of 5 mm (0.20"). Its weight must not go over 100 g (3.53 oz). In simple terms, it is a letter that is no bigger than a C5 envelope with no more than a few sheets of A4 paper. Examples are most letters, bills and statements.
Large Letter
The size is a piece of mail that has a maximum length of 353 mm (13.90"), a width of 250 mm (9.84") and a thickness of 25 mm (0.98"). It can weigh up to 750 g (26.46 oz).<ref name=roymail /> In layman's terms, it is anything smaller than a C4 envelope with about 100 pieces of A4 paper. Example of this are many brochures, catalogues and company reports, some magazines, or DVDs in their boxes.
Small Packet
The size is a piece of mail that has a maximum length of 450 mm (17.71"), a width of 350 mm (13.8") and a thickness of 160 mm (6.30"). It can weigh up to 2 kg (70.48 oz).<ref name=roymail />
Packet
The size is a piece of mail that has a maximum length of 610 mm (24.02"), a width of 460 mm (18.11") and a thickness of 460 mm (18.11"). It can weigh up to 20 kg (704.8 oz).<ref name=roymail /> Items larger or heavier than this, if a Royal Mail service is essential, must be sent by Parcelforce.
 
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