Hi Denise,
Not wanting to give you any misleading information I spoke with someone in our customer services department. They have said that the recommendation from the Passport Office is the passport must have 6 months from the date of return for international travel. As a company we follow and recommend these guidelines. For some countries it may be less, however it is advisable to have a longer expiry date for unexpected circumstances such as being taken ill abroad and unable to travel home at the end of the holiday.
I hope this information helps.
Kindest regards,
Julia