Europe up to 40 grams self-adhesive stamp (current value £1.70). Importantly these can now be used on standard airmail letters up to 100 grams in weight. The Royal Mail harmonised all of their rates to make the system more simple.
Although it only says up to 40 grams on the stamp the new Royal mail rates from 30th March 2015 means these stamps now cover you for letters up to 100 grams.
