If you browse this section forum there are a ton of Q's & A's on International return postage.
The general advice is to obtain stamps from the return country or their paper currency (we have a £5 and a £10 note).
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[quote="kimmylee"]Ok, so UK post going abroad is done by weight only, and falls into two categories, Letters and Small Packets.

Your item would be a small packet. If you input this and the weight to the Royal Mail calculator, it will come up with your price. It will be expensive I will warn you.

http://www.royalmail.com/price-finder[/quote]

Thaks for the reply. I used the price finder to calculate the mailing cost. It would be £7.20, which isn't all that bad. Cheap enough that I might chance it. I'm not sure how to apply the postage though as the only option I appear to have is to purchase "online postage" which I know expires after 24-hours.

Ok, so UK post going abroad is done by weight only, and falls into two categories, Letters and Small Packets.

Your item would be a small packet. If you input this and the weight to the Royal Mail calculator, it will come up with your price. It will be expensive I will warn you.

http://www.royalmail.com/price-finder

So I am looking to include a SASE with a LOR and a graphic novel I would like to have signed (I know there is a decent chance I will not get it back) in a packet I am sending to the UK and am having a hard time determining what postage I need. On the back of the Large Letter 1st Class stamp book it states the dimensions and weight. My packet is within the dimension requirements but above the weight requirements. The stamps are good for 100g, my packet will weigh just under 400g. Does that mean it will require 4, 1st Class stamps? Or some other postage?

Any help is appreciated.