Here is a summary of the UK to Japan airmail postage rates for small packages (from information on the Royal Mail web site). Notes: 1. * Valid December 2006 2. * Calculated at £1 = ¥228. 3. * The actual charges are in 20g increments, but I didn't want to list them all. 4. * The surface rates are almost exactly 50% of the Airmail rates, but they are in 50g increments. 5. * 2000g is the maximum weight that can be sent by this "Small Packet" service.