With the passport office already struggling to get through a backlog which came as the result of the COVID-19 lockdown, holidaymakers should plan in advance if they hope to secure a passport in time for their trip.
It costs £75.50 to renew or replace a passport via the online application, or £85 if travellers fill in a paper form.
There is also the potential of rising mobile phone costs.
At the time of writing, holidaymakers can enjoy free mobile roaming throughout the EU, Iceland, Liechtenstein and Norway.
This is set to end on January 1.
According to Which? providers including EE, O2 and Three have vowed not to reintroduce charges.
The Government has also introduced a £45-a-month cap on the amount customers can be charged while using data abroad, after this, they will have to opt in to continue using their devices.
Regardless of the phone provider you are with, Which? urges customers to check their mobile phone policy plan before travel.
The Government’s “Check, Change, Go” campaign was initially kick-started in August, but is continually being updated with new information.