UK residents receive annual inflationary increases to their state pension benefits. Expats living in the EU are protected by EU law and continue to receive these annual increases, but those resident in countries such as Australia, New Zealand and Canada and many other countries do not.
To be entitled to the annual increase you need to be resident in an EU or European Economic Area (EEA) country, Switzerland, or a country with which the UK has a social security agreement which includes a clause entitling recipients to an annual increase.
The UK does not currently have any bilateral agreements in place with EU countries, other than at a general EU level, so what will happen after Brexit? Looking at the past as a guide there appears to be some good news.
The legal framework and administrative processes already in place give the state pension annual increase to retirees living in an EU country.
The UK has also proved willing to adopt a positive approach to the entitlement of increases in times of change (the breaking up of Yugoslavia being a case in point).
If however the government was under pressure to raise money following Brexit, it could potentially take steps to prevent those not contributing to the UK economy from receiving benefits such as the annual rise in the state pension.
Only time will tell, but comfort can be taken by the fact that recent history, coupled with the framework already in place, suggests that the annual increase may well continue for those living in EU countries.