When does a revocation clause in a later will revoke an earlier will made in another jurisdiction?

With increasing international mobility, and with more testators building up property in different countries, the numbers of cases where a testator has more than one will are on the increase. Even if it may be possible to have one will which deals with a testator’s entire estate, often testators do not take this approach and prefer to make multiple wills with the help of specialist advisers in each relevant country.