Australia and New Zealand are popular destination for people living in Britain & Ireland and holidays to the other side of the world are often treated as a once-in-lifetime trip. Many Pacific Islands are also popular and are often seen as even more exotic.
As well as Australia and New Zealand, many of the Pacific Islands are English-speaking. There is also a common interest in sport! With many iconic places to visit, for many British people there are relatives and members of their family living down-under.
However, it should be remembered that these countries are the furthest from the UK resulting in limited options for both holidays deals.