The most important element of moving from or returning to the UK is planning ahead.
Even for seasoned Expats that have lived in several countries, relocating internationally marks a big change. Tax laws, property markets and day-to-day expenses can vary greatly from country to country, and it is highly important that you research the country you are moving to so that you can adequately prepare for these changes.
Even if you are returning to a country that you have lived in before, often tax laws change over time, so it is still necessary to ensure that you are fully protected.
That said, moving abroad also brings with it new opportunities for savings and investments, which can be greatly beneficial if fully taken advantage of.