http://www.royalmail.com/sites/default/files/Royal_Mail_Our_Prices.pdf
New price list so according to that:
Packet - Over 353mm (L) x 250mm (W) x 25mm (D)
0–750g £2.70 £2.20
751–1000g £4.30 £3.50
First and second class prices there boo!
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