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I'm not too familiar with sending to the UK as I've only ever sent to the US. If I were to send a SASE weighing under a 100g from Britain back home (Ireland/International) how many first class large envelope stamps would I use?

Any help about stamp values/prices would be appreciated,
Mark V.

A First Class Large stamp is worth £1.01.

You can find out how much postage your SASE will need here:

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

International Standard is the service you need, which is just a fancy name for Airmail!